diff --git a/src/Components/Blazor/Build/src/ReferenceFromSource.props b/src/Components/Blazor/Build/src/ReferenceFromSource.props
index 209519e93213..c98b209ff8ca 100644
--- a/src/Components/Blazor/Build/src/ReferenceFromSource.props
+++ b/src/Components/Blazor/Build/src/ReferenceFromSource.props
@@ -11,7 +11,7 @@
 
   <PropertyGroup>
     <BlazorBuildReferenceFromSource>true</BlazorBuildReferenceFromSource>
-    <BlazorJsPath>$(RepositoryRoot)src\Components\Browser.JS\dist\$(Configuration)\blazor.*.js</BlazorJsPath>
+    <BlazorJsPath>$(RepositoryRoot)src\Components\Browser.JS\dist\$(Configuration)\blazor.*.js.*</BlazorJsPath>
   </PropertyGroup>
 
   <Import Project="$(MSBuildThisFileDirectory)targets/All.props" />
diff --git a/src/Components/Browser.JS/dist/Debug/blazor.server.js b/src/Components/Browser.JS/dist/Debug/blazor.server.js
index 51fade0f26f1..b8f0eb6fb45e 100644
--- a/src/Components/Browser.JS/dist/Debug/blazor.server.js
+++ b/src/Components/Browser.JS/dist/Debug/blazor.server.js
@@ -13263,7 +13263,13 @@ var BrowserRenderer = /** @class */ (function () {
                 clearBetween(rootElementToClear, rootElementToClearEnd);
             }
         }
+        var ownerDocument = LogicalElements_1.getClosestDomElement(element).ownerDocument;
+        var activeElementBefore = ownerDocument && ownerDocument.activeElement;
         this.applyEdits(batch, element, 0, edits, referenceFrames);
+        // Try to restore focus in case it was lost due to an element move
+        if ((activeElementBefore instanceof HTMLElement) && ownerDocument && ownerDocument.activeElement !== activeElementBefore) {
+            activeElementBefore.focus();
+        }
     };
     BrowserRenderer.prototype.disposeComponent = function (componentId) {
         delete this.childComponentLocations[componentId];
@@ -13277,6 +13283,7 @@ var BrowserRenderer = /** @class */ (function () {
     BrowserRenderer.prototype.applyEdits = function (batch, parent, childIndex, edits, referenceFrames) {
         var currentDepth = 0;
         var childIndexAtCurrentDepth = childIndex;
+        var permutationList;
         var arraySegmentReader = batch.arraySegmentReader;
         var editReader = batch.editReader;
         var frameReader = batch.frameReader;
@@ -13365,6 +13372,19 @@ var BrowserRenderer = /** @class */ (function () {
                     childIndexAtCurrentDepth = currentDepth === 0 ? childIndex : 0; // The childIndex is only ever nonzero at zero depth
                     break;
                 }
+                case RenderBatch_1.EditType.permutationListEntry: {
+                    permutationList = permutationList || [];
+                    permutationList.push({
+                        fromSiblingIndex: childIndexAtCurrentDepth + editReader.siblingIndex(edit),
+                        toSiblingIndex: childIndexAtCurrentDepth + editReader.moveToSiblingIndex(edit),
+                    });
+                    break;
+                }
+                case RenderBatch_1.EditType.permutationListEnd: {
+                    LogicalElements_1.permuteLogicalChildren(parent, permutationList);
+                    permutationList = undefined;
+                    break;
+                }
                 default: {
                     var unknownType = editType; // Compile-time verification that the switch was exhaustive
                     throw new Error("Unknown edit type: " + unknownType);
@@ -14169,11 +14189,54 @@ function getLogicalChildrenArray(element) {
     return element[logicalChildrenPropname];
 }
 exports.getLogicalChildrenArray = getLogicalChildrenArray;
-function getLogicalNextSibling(element) {
-    var siblings = getLogicalChildrenArray(getLogicalParent(element));
-    var siblingIndex = Array.prototype.indexOf.call(siblings, element);
-    return siblings[siblingIndex + 1] || null;
+function permuteLogicalChildren(parent, permutationList) {
+    // The permutationList must represent a valid permutation, i.e., the list of 'from' indices
+    // is distinct, and the list of 'to' indices is a permutation of it. The algorithm here
+    // relies on that assumption.
+    // Each of the phases here has to happen separately, because each one is designed not to
+    // interfere with the indices or DOM entries used by subsequent phases.
+    // Phase 1: track which nodes we will move
+    var siblings = getLogicalChildrenArray(parent);
+    permutationList.forEach(function (listEntry) {
+        listEntry.moveRangeStart = siblings[listEntry.fromSiblingIndex];
+        listEntry.moveRangeEnd = findLastDomNodeInRange(listEntry.moveRangeStart);
+    });
+    // Phase 2: insert markers
+    permutationList.forEach(function (listEntry) {
+        var marker = listEntry.moveToBeforeMarker = document.createComment('marker');
+        var insertBeforeNode = siblings[listEntry.toSiblingIndex + 1];
+        if (insertBeforeNode) {
+            insertBeforeNode.parentNode.insertBefore(marker, insertBeforeNode);
+        }
+        else {
+            appendDomNode(marker, parent);
+        }
+    });
+    // Phase 3: move descendants & remove markers
+    permutationList.forEach(function (listEntry) {
+        var insertBefore = listEntry.moveToBeforeMarker;
+        var parentDomNode = insertBefore.parentNode;
+        var elementToMove = listEntry.moveRangeStart;
+        var moveEndNode = listEntry.moveRangeEnd;
+        var nextToMove = elementToMove;
+        while (nextToMove) {
+            var nextNext = nextToMove.nextSibling;
+            parentDomNode.insertBefore(nextToMove, insertBefore);
+            if (nextToMove === moveEndNode) {
+                break;
+            }
+            else {
+                nextToMove = nextNext;
+            }
+        }
+        parentDomNode.removeChild(insertBefore);
+    });
+    // Phase 4: update siblings index
+    permutationList.forEach(function (listEntry) {
+        siblings[listEntry.toSiblingIndex] = listEntry.moveRangeStart;
+    });
 }
+exports.permuteLogicalChildren = permuteLogicalChildren;
 function getClosestDomElement(logicalElement) {
     if (logicalElement instanceof Element) {
         return logicalElement;
@@ -14185,6 +14248,12 @@ function getClosestDomElement(logicalElement) {
         throw new Error('Not a valid logical element');
     }
 }
+exports.getClosestDomElement = getClosestDomElement;
+function getLogicalNextSibling(element) {
+    var siblings = getLogicalChildrenArray(getLogicalParent(element));
+    var siblingIndex = Array.prototype.indexOf.call(siblings, element);
+    return siblings[siblingIndex + 1] || null;
+}
 function appendDomNode(child, parent) {
     // This function only puts 'child' into the DOM in the right place relative to 'parent'
     // It does not update the logical children array of anything
@@ -14208,6 +14277,26 @@ function appendDomNode(child, parent) {
         throw new Error("Cannot append node because the parent is not a valid logical element. Parent: " + parent);
     }
 }
+// Returns the final node (in depth-first evaluation order) that is a descendant of the logical element.
+// As such, the entire subtree is between 'element' and 'findLastDomNodeInRange(element)' inclusive.
+function findLastDomNodeInRange(element) {
+    if (element instanceof Element) {
+        return element;
+    }
+    var nextSibling = getLogicalNextSibling(element);
+    if (nextSibling) {
+        // Simple case: not the last logical sibling, so take the node before the next sibling
+        return nextSibling.previousSibling;
+    }
+    else {
+        // Harder case: there's no logical next-sibling, so recurse upwards until we find
+        // a logical ancestor that does have one, or a physical element
+        var logicalParent = getLogicalParent(element);
+        return logicalParent instanceof Element
+            ? logicalParent.lastChild
+            : findLastDomNodeInRange(logicalParent);
+    }
+}
 function createSymbolOrFallback(fallback) {
     return typeof Symbol === 'function' ? Symbol() : fallback;
 }
@@ -14303,6 +14392,9 @@ var OutOfProcessRenderTreeEditReader = /** @class */ (function () {
     OutOfProcessRenderTreeEditReader.prototype.newTreeIndex = function (edit) {
         return readInt32LE(this.batchDataUint8, edit + 8); // 3rd int
     };
+    OutOfProcessRenderTreeEditReader.prototype.moveToSiblingIndex = function (edit) {
+        return readInt32LE(this.batchDataUint8, edit + 8); // 3rd int
+    };
     OutOfProcessRenderTreeEditReader.prototype.removedAttributeName = function (edit) {
         var stringIndex = readInt32LE(this.batchDataUint8, edit + 12); // 4th int
         return this.stringReader.readString(stringIndex);
@@ -14458,6 +14550,8 @@ var EditType;
     EditType[EditType["stepIn"] = 6] = "stepIn";
     EditType[EditType["stepOut"] = 7] = "stepOut";
     EditType[EditType["updateMarkup"] = 8] = "updateMarkup";
+    EditType[EditType["permutationListEntry"] = 9] = "permutationListEntry";
+    EditType[EditType["permutationListEnd"] = 10] = "permutationListEnd";
 })(EditType = exports.EditType || (exports.EditType = {}));
 var FrameType;
 (function (FrameType) {
diff --git a/src/Components/Browser.JS/dist/Debug/blazor.webassembly.js b/src/Components/Browser.JS/dist/Debug/blazor.webassembly.js
index bae138186598..7df07ee7b40d 100644
--- a/src/Components/Browser.JS/dist/Debug/blazor.webassembly.js
+++ b/src/Components/Browser.JS/dist/Debug/blazor.webassembly.js
@@ -1023,7 +1023,13 @@ var BrowserRenderer = /** @class */ (function () {
                 clearBetween(rootElementToClear, rootElementToClearEnd);
             }
         }
+        var ownerDocument = LogicalElements_1.getClosestDomElement(element).ownerDocument;
+        var activeElementBefore = ownerDocument && ownerDocument.activeElement;
         this.applyEdits(batch, element, 0, edits, referenceFrames);
+        // Try to restore focus in case it was lost due to an element move
+        if ((activeElementBefore instanceof HTMLElement) && ownerDocument && ownerDocument.activeElement !== activeElementBefore) {
+            activeElementBefore.focus();
+        }
     };
     BrowserRenderer.prototype.disposeComponent = function (componentId) {
         delete this.childComponentLocations[componentId];
@@ -1037,6 +1043,7 @@ var BrowserRenderer = /** @class */ (function () {
     BrowserRenderer.prototype.applyEdits = function (batch, parent, childIndex, edits, referenceFrames) {
         var currentDepth = 0;
         var childIndexAtCurrentDepth = childIndex;
+        var permutationList;
         var arraySegmentReader = batch.arraySegmentReader;
         var editReader = batch.editReader;
         var frameReader = batch.frameReader;
@@ -1125,6 +1132,19 @@ var BrowserRenderer = /** @class */ (function () {
                     childIndexAtCurrentDepth = currentDepth === 0 ? childIndex : 0; // The childIndex is only ever nonzero at zero depth
                     break;
                 }
+                case RenderBatch_1.EditType.permutationListEntry: {
+                    permutationList = permutationList || [];
+                    permutationList.push({
+                        fromSiblingIndex: childIndexAtCurrentDepth + editReader.siblingIndex(edit),
+                        toSiblingIndex: childIndexAtCurrentDepth + editReader.moveToSiblingIndex(edit),
+                    });
+                    break;
+                }
+                case RenderBatch_1.EditType.permutationListEnd: {
+                    LogicalElements_1.permuteLogicalChildren(parent, permutationList);
+                    permutationList = undefined;
+                    break;
+                }
                 default: {
                     var unknownType = editType; // Compile-time verification that the switch was exhaustive
                     throw new Error("Unknown edit type: " + unknownType);
@@ -1929,11 +1949,54 @@ function getLogicalChildrenArray(element) {
     return element[logicalChildrenPropname];
 }
 exports.getLogicalChildrenArray = getLogicalChildrenArray;
-function getLogicalNextSibling(element) {
-    var siblings = getLogicalChildrenArray(getLogicalParent(element));
-    var siblingIndex = Array.prototype.indexOf.call(siblings, element);
-    return siblings[siblingIndex + 1] || null;
+function permuteLogicalChildren(parent, permutationList) {
+    // The permutationList must represent a valid permutation, i.e., the list of 'from' indices
+    // is distinct, and the list of 'to' indices is a permutation of it. The algorithm here
+    // relies on that assumption.
+    // Each of the phases here has to happen separately, because each one is designed not to
+    // interfere with the indices or DOM entries used by subsequent phases.
+    // Phase 1: track which nodes we will move
+    var siblings = getLogicalChildrenArray(parent);
+    permutationList.forEach(function (listEntry) {
+        listEntry.moveRangeStart = siblings[listEntry.fromSiblingIndex];
+        listEntry.moveRangeEnd = findLastDomNodeInRange(listEntry.moveRangeStart);
+    });
+    // Phase 2: insert markers
+    permutationList.forEach(function (listEntry) {
+        var marker = listEntry.moveToBeforeMarker = document.createComment('marker');
+        var insertBeforeNode = siblings[listEntry.toSiblingIndex + 1];
+        if (insertBeforeNode) {
+            insertBeforeNode.parentNode.insertBefore(marker, insertBeforeNode);
+        }
+        else {
+            appendDomNode(marker, parent);
+        }
+    });
+    // Phase 3: move descendants & remove markers
+    permutationList.forEach(function (listEntry) {
+        var insertBefore = listEntry.moveToBeforeMarker;
+        var parentDomNode = insertBefore.parentNode;
+        var elementToMove = listEntry.moveRangeStart;
+        var moveEndNode = listEntry.moveRangeEnd;
+        var nextToMove = elementToMove;
+        while (nextToMove) {
+            var nextNext = nextToMove.nextSibling;
+            parentDomNode.insertBefore(nextToMove, insertBefore);
+            if (nextToMove === moveEndNode) {
+                break;
+            }
+            else {
+                nextToMove = nextNext;
+            }
+        }
+        parentDomNode.removeChild(insertBefore);
+    });
+    // Phase 4: update siblings index
+    permutationList.forEach(function (listEntry) {
+        siblings[listEntry.toSiblingIndex] = listEntry.moveRangeStart;
+    });
 }
+exports.permuteLogicalChildren = permuteLogicalChildren;
 function getClosestDomElement(logicalElement) {
     if (logicalElement instanceof Element) {
         return logicalElement;
@@ -1945,6 +2008,12 @@ function getClosestDomElement(logicalElement) {
         throw new Error('Not a valid logical element');
     }
 }
+exports.getClosestDomElement = getClosestDomElement;
+function getLogicalNextSibling(element) {
+    var siblings = getLogicalChildrenArray(getLogicalParent(element));
+    var siblingIndex = Array.prototype.indexOf.call(siblings, element);
+    return siblings[siblingIndex + 1] || null;
+}
 function appendDomNode(child, parent) {
     // This function only puts 'child' into the DOM in the right place relative to 'parent'
     // It does not update the logical children array of anything
@@ -1968,6 +2037,26 @@ function appendDomNode(child, parent) {
         throw new Error("Cannot append node because the parent is not a valid logical element. Parent: " + parent);
     }
 }
+// Returns the final node (in depth-first evaluation order) that is a descendant of the logical element.
+// As such, the entire subtree is between 'element' and 'findLastDomNodeInRange(element)' inclusive.
+function findLastDomNodeInRange(element) {
+    if (element instanceof Element) {
+        return element;
+    }
+    var nextSibling = getLogicalNextSibling(element);
+    if (nextSibling) {
+        // Simple case: not the last logical sibling, so take the node before the next sibling
+        return nextSibling.previousSibling;
+    }
+    else {
+        // Harder case: there's no logical next-sibling, so recurse upwards until we find
+        // a logical ancestor that does have one, or a physical element
+        var logicalParent = getLogicalParent(element);
+        return logicalParent instanceof Element
+            ? logicalParent.lastChild
+            : findLastDomNodeInRange(logicalParent);
+    }
+}
 function createSymbolOrFallback(fallback) {
     return typeof Symbol === 'function' ? Symbol() : fallback;
 }
@@ -1996,6 +2085,8 @@ var EditType;
     EditType[EditType["stepIn"] = 6] = "stepIn";
     EditType[EditType["stepOut"] = 7] = "stepOut";
     EditType[EditType["updateMarkup"] = 8] = "updateMarkup";
+    EditType[EditType["permutationListEntry"] = 9] = "permutationListEntry";
+    EditType[EditType["permutationListEnd"] = 10] = "permutationListEnd";
 })(EditType = exports.EditType || (exports.EditType = {}));
 var FrameType;
 (function (FrameType) {
@@ -2089,15 +2180,16 @@ var diffReader = {
 };
 // Keep in sync with memory layout in RenderTreeEdit.cs
 var editReader = {
-    structLength: 16,
+    structLength: 20,
     editType: function (edit) { return Environment_1.platform.readInt32Field(edit, 0); },
     siblingIndex: function (edit) { return Environment_1.platform.readInt32Field(edit, 4); },
     newTreeIndex: function (edit) { return Environment_1.platform.readInt32Field(edit, 8); },
-    removedAttributeName: function (edit) { return Environment_1.platform.readStringField(edit, 12); },
+    moveToSiblingIndex: function (edit) { return Environment_1.platform.readInt32Field(edit, 8); },
+    removedAttributeName: function (edit) { return Environment_1.platform.readStringField(edit, 16); },
 };
 // Keep in sync with memory layout in RenderTreeFrame.cs
 var frameReader = {
-    structLength: 28,
+    structLength: 36,
     frameType: function (frame) { return Environment_1.platform.readInt32Field(frame, 4); },
     subtreeLength: function (frame) { return Environment_1.platform.readInt32Field(frame, 8); },
     elementReferenceCaptureId: function (frame) { return Environment_1.platform.readStringField(frame, 16); },
diff --git a/src/Components/Browser.JS/dist/Release/blazor.server.js b/src/Components/Browser.JS/dist/Release/blazor.server.js
index a9f6e4c9755c..785cfa613a8d 100644
--- a/src/Components/Browser.JS/dist/Release/blazor.server.js
+++ b/src/Components/Browser.JS/dist/Release/blazor.server.js
@@ -1,15 +1,15 @@
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  * The buffer module from node.js, for the browser.
  *
  * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
  * @license  MIT
  */
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diff --git a/src/Components/Browser.JS/dist/Release/blazor.webassembly.js b/src/Components/Browser.JS/dist/Release/blazor.webassembly.js
index 05f2e01ea93f..fc8845acbeee 100644
--- a/src/Components/Browser.JS/dist/Release/blazor.webassembly.js
+++ b/src/Components/Browser.JS/dist/Release/blazor.webassembly.js
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diff --git a/src/Components/Browser.JS/src/Rendering/BrowserRenderer.ts b/src/Components/Browser.JS/src/Rendering/BrowserRenderer.ts
index c083ca97fe51..fda97aa8ec8c 100644
--- a/src/Components/Browser.JS/src/Rendering/BrowserRenderer.ts
+++ b/src/Components/Browser.JS/src/Rendering/BrowserRenderer.ts
@@ -1,7 +1,7 @@
 import { RenderBatch, ArraySegment, RenderTreeEdit, RenderTreeFrame, EditType, FrameType, ArrayValues } from './RenderBatch/RenderBatch';
 import { EventDelegator } from './EventDelegator';
 import { EventForDotNet, UIEventArgs } from './EventForDotNet';
-import { LogicalElement, toLogicalElement, insertLogicalChild, removeLogicalChild, getLogicalParent, getLogicalChild, createAndInsertLogicalContainer, isSvgElement, getLogicalChildrenArray, getLogicalSiblingEnd } from './LogicalElements';
+import { LogicalElement, PermutationListEntry, toLogicalElement, insertLogicalChild, removeLogicalChild, getLogicalParent, getLogicalChild, createAndInsertLogicalContainer, isSvgElement, getLogicalChildrenArray, getLogicalSiblingEnd, permuteLogicalChildren, getClosestDomElement } from './LogicalElements';
 import { applyCaptureIdToElement } from './ElementReferenceCapture';
 const selectValuePropname = '_blazorSelectValue';
 const sharedTemplateElemForParsing = document.createElement('template');
@@ -47,7 +47,15 @@ export class BrowserRenderer {
       }
     }
 
+    const ownerDocument = getClosestDomElement(element).ownerDocument;
+    const activeElementBefore = ownerDocument && ownerDocument.activeElement;
+
     this.applyEdits(batch, element, 0, edits, referenceFrames);
+
+    // Try to restore focus in case it was lost due to an element move
+    if ((activeElementBefore instanceof HTMLElement) && ownerDocument && ownerDocument.activeElement !== activeElementBefore) {
+      activeElementBefore.focus();
+    }
   }
 
   public disposeComponent(componentId: number) {
@@ -65,6 +73,7 @@ export class BrowserRenderer {
   private applyEdits(batch: RenderBatch, parent: LogicalElement, childIndex: number, edits: ArraySegment<RenderTreeEdit>, referenceFrames: ArrayValues<RenderTreeFrame>) {
     let currentDepth = 0;
     let childIndexAtCurrentDepth = childIndex;
+    let permutationList: PermutationListEntry[] | undefined;
 
     const arraySegmentReader = batch.arraySegmentReader;
     const editReader = batch.editReader;
@@ -152,6 +161,19 @@ export class BrowserRenderer {
           childIndexAtCurrentDepth = currentDepth === 0 ? childIndex : 0; // The childIndex is only ever nonzero at zero depth
           break;
         }
+        case EditType.permutationListEntry: {
+          permutationList = permutationList || [];
+          permutationList.push({
+            fromSiblingIndex: childIndexAtCurrentDepth + editReader.siblingIndex(edit),
+            toSiblingIndex: childIndexAtCurrentDepth + editReader.moveToSiblingIndex(edit),
+          });
+          break;
+        }
+        case EditType.permutationListEnd: {
+          permuteLogicalChildren(parent, permutationList!);
+          permutationList = undefined;
+          break;
+        }
         default: {
           const unknownType: never = editType; // Compile-time verification that the switch was exhaustive
           throw new Error(`Unknown edit type: ${unknownType}`);
diff --git a/src/Components/Browser.JS/src/Rendering/LogicalElements.ts b/src/Components/Browser.JS/src/Rendering/LogicalElements.ts
index f52e170fa424..dee2e78e2538 100644
--- a/src/Components/Browser.JS/src/Rendering/LogicalElements.ts
+++ b/src/Components/Browser.JS/src/Rendering/LogicalElements.ts
@@ -155,13 +155,60 @@ export function getLogicalChildrenArray(element: LogicalElement) {
   return element[logicalChildrenPropname] as LogicalElement[];
 }
 
-function getLogicalNextSibling(element: LogicalElement): LogicalElement | null {
-  const siblings = getLogicalChildrenArray(getLogicalParent(element)!);
-  const siblingIndex = Array.prototype.indexOf.call(siblings, element);
-  return siblings[siblingIndex + 1] || null;
+export function permuteLogicalChildren(parent: LogicalElement, permutationList: PermutationListEntry[]) {
+  // The permutationList must represent a valid permutation, i.e., the list of 'from' indices
+  // is distinct, and the list of 'to' indices is a permutation of it. The algorithm here
+  // relies on that assumption.
+
+  // Each of the phases here has to happen separately, because each one is designed not to
+  // interfere with the indices or DOM entries used by subsequent phases.
+
+  // Phase 1: track which nodes we will move
+  const siblings = getLogicalChildrenArray(parent);
+  permutationList.forEach((listEntry: PermutationListEntryWithTrackingData) => {
+    listEntry.moveRangeStart = siblings[listEntry.fromSiblingIndex];
+    listEntry.moveRangeEnd = findLastDomNodeInRange(listEntry.moveRangeStart);
+  });
+
+  // Phase 2: insert markers
+  permutationList.forEach((listEntry: PermutationListEntryWithTrackingData) => {
+    const marker = listEntry.moveToBeforeMarker = document.createComment('marker');
+    const insertBeforeNode = siblings[listEntry.toSiblingIndex + 1] as any as Node;
+    if (insertBeforeNode) {
+      insertBeforeNode.parentNode!.insertBefore(marker, insertBeforeNode);
+    } else {
+      appendDomNode(marker, parent);
+    }
+  });
+
+  // Phase 3: move descendants & remove markers
+  permutationList.forEach((listEntry: PermutationListEntryWithTrackingData) => {
+    const insertBefore = listEntry.moveToBeforeMarker!;
+    const parentDomNode = insertBefore.parentNode!;
+    const elementToMove = listEntry.moveRangeStart!;
+    const moveEndNode = listEntry.moveRangeEnd!;
+    let nextToMove = elementToMove as any as Node | null;
+    while (nextToMove) {
+      const nextNext = nextToMove.nextSibling;
+      parentDomNode.insertBefore(nextToMove, insertBefore);
+
+      if (nextToMove === moveEndNode) {
+        break;
+      } else {
+        nextToMove = nextNext;
+      }
+    }
+
+    parentDomNode.removeChild(insertBefore);
+  });
+
+  // Phase 4: update siblings index
+  permutationList.forEach((listEntry: PermutationListEntryWithTrackingData) => {
+    siblings[listEntry.toSiblingIndex] = listEntry.moveRangeStart!;
+  });
 }
 
-function getClosestDomElement(logicalElement: LogicalElement) {
+export function getClosestDomElement(logicalElement: LogicalElement) {
   if (logicalElement instanceof Element) {
     return logicalElement;
   } else if (logicalElement instanceof Comment) {
@@ -171,6 +218,24 @@ function getClosestDomElement(logicalElement: LogicalElement) {
   }
 }
 
+export interface PermutationListEntry {
+  fromSiblingIndex: number,
+  toSiblingIndex: number,
+}
+
+interface PermutationListEntryWithTrackingData extends PermutationListEntry {
+  // These extra properties are used internally when processing the permutation list
+  moveRangeStart?: LogicalElement,
+  moveRangeEnd?: Node,
+  moveToBeforeMarker?: Node,
+}
+
+function getLogicalNextSibling(element: LogicalElement): LogicalElement | null {
+  const siblings = getLogicalChildrenArray(getLogicalParent(element)!);
+  const siblingIndex = Array.prototype.indexOf.call(siblings, element);
+  return siblings[siblingIndex + 1] || null;
+}
+
 function appendDomNode(child: Node, parent: LogicalElement) {
   // This function only puts 'child' into the DOM in the right place relative to 'parent'
   // It does not update the logical children array of anything
@@ -192,6 +257,27 @@ function appendDomNode(child: Node, parent: LogicalElement) {
   }
 }
 
+// Returns the final node (in depth-first evaluation order) that is a descendant of the logical element.
+// As such, the entire subtree is between 'element' and 'findLastDomNodeInRange(element)' inclusive.
+function findLastDomNodeInRange(element: LogicalElement) {
+  if (element instanceof Element) {
+    return element;
+  }
+
+  const nextSibling = getLogicalNextSibling(element);
+  if (nextSibling) {
+    // Simple case: not the last logical sibling, so take the node before the next sibling
+    return (nextSibling as any as Node).previousSibling;
+  } else {
+    // Harder case: there's no logical next-sibling, so recurse upwards until we find
+    // a logical ancestor that does have one, or a physical element
+    const logicalParent = getLogicalParent(element)!;
+    return logicalParent instanceof Element
+      ? logicalParent.lastChild
+      : findLastDomNodeInRange(logicalParent);
+  }
+}
+
 function createSymbolOrFallback(fallback: string): symbol | string {
   return typeof Symbol === 'function' ? Symbol() : fallback;
 }
diff --git a/src/Components/Browser.JS/src/Rendering/RenderBatch/OutOfProcessRenderBatch.ts b/src/Components/Browser.JS/src/Rendering/RenderBatch/OutOfProcessRenderBatch.ts
index dde028624f4d..b33025e55d6f 100644
--- a/src/Components/Browser.JS/src/Rendering/RenderBatch/OutOfProcessRenderBatch.ts
+++ b/src/Components/Browser.JS/src/Rendering/RenderBatch/OutOfProcessRenderBatch.ts
@@ -100,6 +100,10 @@ class OutOfProcessRenderTreeEditReader implements RenderTreeEditReader {
     return readInt32LE(this.batchDataUint8, edit as any + 8); // 3rd int
   }
 
+  moveToSiblingIndex(edit: RenderTreeEdit) {
+    return readInt32LE(this.batchDataUint8, edit as any + 8); // 3rd int
+  }
+
   removedAttributeName(edit: RenderTreeEdit) {
     const stringIndex = readInt32LE(this.batchDataUint8, edit as any + 12); // 4th int
     return this.stringReader.readString(stringIndex);
diff --git a/src/Components/Browser.JS/src/Rendering/RenderBatch/RenderBatch.ts b/src/Components/Browser.JS/src/Rendering/RenderBatch/RenderBatch.ts
index 3faddab664e0..88a162a447c2 100644
--- a/src/Components/Browser.JS/src/Rendering/RenderBatch/RenderBatch.ts
+++ b/src/Components/Browser.JS/src/Rendering/RenderBatch/RenderBatch.ts
@@ -37,6 +37,7 @@ export interface RenderTreeEditReader {
   editType(edit: RenderTreeEdit): EditType;
   siblingIndex(edit: RenderTreeEdit): number;
   newTreeIndex(edit: RenderTreeEdit): number;
+  moveToSiblingIndex(edit: RenderTreeEdit): number;
   removedAttributeName(edit: RenderTreeEdit): string | null;
 }
 
@@ -71,6 +72,8 @@ export enum EditType {
   stepIn = 6,
   stepOut = 7,
   updateMarkup = 8,
+  permutationListEntry = 9,
+  permutationListEnd = 10,
 }
 
 export enum FrameType {
diff --git a/src/Components/Browser.JS/src/Rendering/RenderBatch/SharedMemoryRenderBatch.ts b/src/Components/Browser.JS/src/Rendering/RenderBatch/SharedMemoryRenderBatch.ts
index 4eb5792bdaed..2173cb1ecfc6 100644
--- a/src/Components/Browser.JS/src/Rendering/RenderBatch/SharedMemoryRenderBatch.ts
+++ b/src/Components/Browser.JS/src/Rendering/RenderBatch/SharedMemoryRenderBatch.ts
@@ -83,16 +83,17 @@ const diffReader = {
 
 // Keep in sync with memory layout in RenderTreeEdit.cs
 const editReader = {
-  structLength: 16,
+  structLength: 20,
   editType: (edit: RenderTreeEdit) => platform.readInt32Field(edit as any, 0) as EditType,
   siblingIndex: (edit: RenderTreeEdit) => platform.readInt32Field(edit as any, 4),
   newTreeIndex: (edit: RenderTreeEdit) => platform.readInt32Field(edit as any, 8),
-  removedAttributeName: (edit: RenderTreeEdit) => platform.readStringField(edit as any, 12),
+  moveToSiblingIndex: (edit: RenderTreeEdit) => platform.readInt32Field(edit as any, 8),
+  removedAttributeName: (edit: RenderTreeEdit) => platform.readStringField(edit as any, 16),
 };
 
 // Keep in sync with memory layout in RenderTreeFrame.cs
 const frameReader = {
-  structLength: 28,
+  structLength: 36,
   frameType: (frame: RenderTreeFrame) => platform.readInt32Field(frame as any, 4) as FrameType,
   subtreeLength: (frame: RenderTreeFrame) => platform.readInt32Field(frame as any, 8),
   elementReferenceCaptureId: (frame: RenderTreeFrame) => platform.readStringField(frame as any, 16),
diff --git a/src/Components/Browser/src/RendererRegistryEventDispatcher.cs b/src/Components/Browser/src/RendererRegistryEventDispatcher.cs
index 469a0dcae022..1ddc01f33590 100644
--- a/src/Components/Browser/src/RendererRegistryEventDispatcher.cs
+++ b/src/Components/Browser/src/RendererRegistryEventDispatcher.cs
@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Components.Rendering;
 using Microsoft.JSInterop;
@@ -13,6 +14,10 @@ namespace Microsoft.AspNetCore.Components.Browser
     /// </summary>
     public static class RendererRegistryEventDispatcher
     {
+        private static bool isDispatchingEvent;
+        private static Queue<IncomingEventInfo> deferredIncomingEvents
+            = new Queue<IncomingEventInfo>();
+
         /// <summary>
         /// For framework use only.
         /// </summary>
@@ -20,9 +25,62 @@ public static class RendererRegistryEventDispatcher
         public static Task DispatchEvent(
             BrowserEventDescriptor eventDescriptor, string eventArgsJson)
         {
-            var eventArgs = ParseEventArgsJson(eventDescriptor.EventArgsType, eventArgsJson);
-            var renderer = RendererRegistry.Current.Find(eventDescriptor.BrowserRendererId);
-            return renderer.DispatchEventAsync(eventDescriptor.EventHandlerId, eventArgs);
+            // Be sure we only run one event handler at once. Although they couldn't run
+            // simultaneously anyway (there's only one thread), they could run nested on
+            // the stack if somehow one event handler triggers another event synchronously.
+            // We need event handlers not to overlap because (a) that's consistent with
+            // server-side Blazor which uses a sync context, and (b) the rendering logic
+            // relies completely on the idea that within a given scope it's only building
+            // or processing one batch at a time.
+            //
+            // The only currently known case where this makes a difference is in the E2E
+            // tests in ReorderingFocusComponent, where we hit what seems like a Chrome bug
+            // where mutating the DOM cause an element's "change" to fire while its "input"
+            // handler is still running (i.e., nested on the stack) -- this doesn't happen
+            // in Firefox. Possibly a future version of Chrome may fix this, but even then,
+            // it's conceivable that DOM mutation events could trigger this too.
+
+            if (isDispatchingEvent)
+            {
+                var info = new IncomingEventInfo(eventDescriptor, eventArgsJson);
+                deferredIncomingEvents.Enqueue(info);
+                return info.TaskCompletionSource.Task;
+            }
+            else
+            {
+                isDispatchingEvent = true;
+                try
+                {
+                    var eventArgs = ParseEventArgsJson(eventDescriptor.EventArgsType, eventArgsJson);
+                    var renderer = RendererRegistry.Current.Find(eventDescriptor.BrowserRendererId);
+                    return renderer.DispatchEventAsync(eventDescriptor.EventHandlerId, eventArgs);
+                }
+                finally
+                {
+                    isDispatchingEvent = false;
+                    if (deferredIncomingEvents.Count > 0)
+                    {
+                        ProcessNextDeferredEvent();
+                    }
+                }
+            }
+        }
+
+        private static void ProcessNextDeferredEvent()
+        {
+            var info = deferredIncomingEvents.Dequeue();
+            var task = DispatchEvent(info.EventDescriptor, info.EventArgsJson);
+            task.ContinueWith(_ =>
+            {
+                if (task.Exception != null)
+                {
+                    info.TaskCompletionSource.SetException(task.Exception);
+                }
+                else
+                {
+                    info.TaskCompletionSource.SetResult(null);
+                }
+            });
         }
 
         private static UIEventArgs ParseEventArgsJson(string eventArgsType, string eventArgsJson)
@@ -78,5 +136,19 @@ public class BrowserEventDescriptor
             /// </summary>
             public string EventArgsType { get; set; }
         }
+
+        readonly struct IncomingEventInfo
+        {
+            public readonly BrowserEventDescriptor EventDescriptor;
+            public readonly string EventArgsJson;
+            public readonly TaskCompletionSource<object> TaskCompletionSource;
+
+            public IncomingEventInfo(BrowserEventDescriptor eventDescriptor, string eventArgsJson)
+            {
+                EventDescriptor = eventDescriptor;
+                EventArgsJson = eventArgsJson;
+                TaskCompletionSource = new TaskCompletionSource<object>();
+            }
+        }
     }
 }
diff --git a/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs b/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs
index 37431bbb5695..95c356e520e7 100644
--- a/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs
+++ b/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs
@@ -771,12 +771,18 @@ public readonly partial struct RenderTreeDiff
         public readonly int ComponentId;
         public readonly System.ArraySegment<Microsoft.AspNetCore.Components.RenderTree.RenderTreeEdit> Edits;
     }
-    [System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]
+    [System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Explicit)]
     public readonly partial struct RenderTreeEdit
     {
+        [System.Runtime.InteropServices.FieldOffsetAttribute(8)]
+        public readonly int MoveToSiblingIndex;
+        [System.Runtime.InteropServices.FieldOffsetAttribute(8)]
         public readonly int ReferenceFrameIndex;
+        [System.Runtime.InteropServices.FieldOffsetAttribute(16)]
         public readonly string RemovedAttributeName;
+        [System.Runtime.InteropServices.FieldOffsetAttribute(4)]
         public readonly int SiblingIndex;
+        [System.Runtime.InteropServices.FieldOffsetAttribute(0)]
         public readonly Microsoft.AspNetCore.Components.RenderTree.RenderTreeEditType Type;
     }
     public enum RenderTreeEditType
@@ -789,6 +795,8 @@ public enum RenderTreeEditType
         StepIn = 6,
         StepOut = 7,
         UpdateMarkup = 8,
+        PermutationListEntry = 9,
+        PermutationListEnd = 10,
     }
     public enum RenderTreeFrameType
     {
diff --git a/src/Components/Components/src/RenderTree/RenderTreeBuilder.cs b/src/Components/Components/src/RenderTree/RenderTreeBuilder.cs
index 24f07042c43d..78a174885bf3 100644
--- a/src/Components/Components/src/RenderTree/RenderTreeBuilder.cs
+++ b/src/Components/Components/src/RenderTree/RenderTreeBuilder.cs
@@ -454,13 +454,30 @@ public void OpenComponent(int sequence, Type componentType)
         /// <param name="value">The value for the key.</param>
         public void SetKey(object value)
         {
-            // This is just a placeholder to enable work in parallel in the
-            // aspnetcore-tooling repo.
-            //
-            // The real implementation will involve multiple overloads, likely:
-            //   SetKey(int value) -- underlying logic
-            //   SetKey<T>(T value) where T: struct -- avoids boxing 'value' before calling .GetHashCode()
-            //   SetKey(object value) -- performs null check before calling .GetHashCode()
+            if (value == null)
+            {
+                throw new ArgumentNullException(nameof(value));
+            }
+
+            var parentFrameIndex = GetCurrentParentFrameIndex();
+            if (!parentFrameIndex.HasValue)
+            {
+                throw new InvalidOperationException("Cannot set a key outside the scope of a component or element.");
+            }
+
+            var parentFrameIndexValue = parentFrameIndex.Value;
+            ref var parentFrame = ref _entries.Buffer[parentFrameIndexValue];
+            switch (parentFrame.FrameType)
+            {
+                case RenderTreeFrameType.Element:
+                    parentFrame = parentFrame.WithElementKey(value); // It's a ref var, so this writes to the array
+                    break;
+                case RenderTreeFrameType.Component:
+                    parentFrame = parentFrame.WithComponentKey(value); // It's a ref var, so this writes to the array
+                    break;
+                default:
+                    throw new InvalidOperationException($"Cannot set a key on a frame of type {parentFrame.FrameType}.");
+            }
         }
 
         private void OpenComponentUnchecked(int sequence, Type componentType)
diff --git a/src/Components/Components/src/RenderTree/RenderTreeDiffBuilder.cs b/src/Components/Components/src/RenderTree/RenderTreeDiffBuilder.cs
index 6a0514462dea..baaf6097de20 100644
--- a/src/Components/Components/src/RenderTree/RenderTreeDiffBuilder.cs
+++ b/src/Components/Components/src/RenderTree/RenderTreeDiffBuilder.cs
@@ -3,13 +3,14 @@
 
 using System;
 using System.Collections.Generic;
-using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Rendering;
 
 namespace Microsoft.AspNetCore.Components.RenderTree
 {
     internal static class RenderTreeDiffBuilder
     {
+        enum DiffAction { Match, Insert, Delete }
+
         public static RenderTreeDiff ComputeDiff(
             Renderer renderer,
             RenderBatchBuilder batchBuilder,
@@ -35,107 +36,302 @@ private static void AppendDiffEntriesForRange(
             int oldStartIndex, int oldEndIndexExcl,
             int newStartIndex, int newEndIndexExcl)
         {
+            // This is deliberately a very large method. Parts of it could be factored out
+            // into other private methods, but doing so comes at a consequential perf cost,
+            // because it involves so much parameter passing. You can think of the code here
+            // as being several private methods (delimited by #region) pre-inlined.
+            //
+            // A naive "extract methods"-type refactoring will worsen perf by about 10%. So,
+            // if you plan to refactor this, be sure to benchmark the old and new versions
+            // on Mono WebAssembly.
+
             var hasMoreOld = oldEndIndexExcl > oldStartIndex;
             var hasMoreNew = newEndIndexExcl > newStartIndex;
             var prevOldSeq = -1;
             var prevNewSeq = -1;
             var oldTree = diffContext.OldTree;
             var newTree = diffContext.NewTree;
-            while (hasMoreOld || hasMoreNew)
-            {
-                var oldSeq = hasMoreOld ? oldTree[oldStartIndex].Sequence : int.MaxValue;
-                var newSeq = hasMoreNew ? newTree[newStartIndex].Sequence : int.MaxValue;
+            var matchWithNewTreeIndex = -1; // Only used when action == DiffAction.Match
+            Dictionary<object, KeyedItemInfo> keyedItemInfos = null;
 
-                if (oldSeq == newSeq)
-                {
-                    AppendDiffEntriesForFramesWithSameSequence(ref diffContext, oldStartIndex, newStartIndex);
-                    oldStartIndex = NextSiblingIndex(oldTree[oldStartIndex], oldStartIndex);
-                    newStartIndex = NextSiblingIndex(newTree[newStartIndex], newStartIndex);
-                    hasMoreOld = oldEndIndexExcl > oldStartIndex;
-                    hasMoreNew = newEndIndexExcl > newStartIndex;
-                    prevOldSeq = oldSeq;
-                    prevNewSeq = newSeq;
-                }
-                else
+            try
+            {
+                while (hasMoreOld || hasMoreNew)
                 {
-                    bool treatAsInsert;
-                    var oldLoopedBack = oldSeq <= prevOldSeq;
-                    var newLoopedBack = newSeq <= prevNewSeq;
-                    if (oldLoopedBack == newLoopedBack)
+                    DiffAction action;
+
+                    #region "Read keys and sequence numbers"
+                    int oldSeq, newSeq;
+                    object oldKey, newKey;
+                    if (hasMoreOld)
                     {
-                        // Both sequences are proceeding through the same loop block, so do a simple
-                        // preordered merge join (picking from whichever side brings us closer to being
-                        // back in sync)
-                        treatAsInsert = newSeq < oldSeq;
+                        ref var oldFrame = ref oldTree[oldStartIndex];
+                        oldSeq = oldFrame.Sequence;
+                        oldKey = KeyValue(ref oldFrame);
+                    }
+                    else
+                    {
+                        oldSeq = int.MaxValue;
+                        oldKey = null;
+                    }
 
-                        if (oldLoopedBack)
-                        {
-                            // If both old and new have now looped back, we must reset their 'looped back'
-                            // tracker so we can treat them as proceeding through the same loop block
-                            prevOldSeq = prevNewSeq = -1;
-                        }
+                    if (hasMoreNew)
+                    {
+                        ref var newFrame = ref newTree[newStartIndex];
+                        newSeq = newFrame.Sequence;
+                        newKey = KeyValue(ref newFrame);
                     }
-                    else if (oldLoopedBack)
+                    else
+                    {
+                        newSeq = int.MaxValue;
+                        newKey = null;
+                    }
+                    #endregion
+
+                    // If there's a key on either side, prefer matching by key not sequence
+                    if (oldKey != null || newKey != null)
                     {
-                        // Old sequence looped back but new one didn't
-                        // The new sequence either has some extra trailing elements in the current loop block
-                        // which we should insert, or omits some old trailing loop blocks which we should delete
-                        // TODO: Find a way of not recomputing this next flag on every iteration
-                        var newLoopsBackLater = false;
-                        for (var testIndex = newStartIndex + 1; testIndex < newEndIndexExcl; testIndex++)
+                        #region "Get diff action by matching on key"
+                        if (Equals(oldKey, newKey))
+                        {
+                            // Keys match
+                            action = DiffAction.Match;
+                            matchWithNewTreeIndex = newStartIndex;
+                        }
+                        else
                         {
-                            if (newTree[testIndex].Sequence < newSeq)
+                            // Keys don't match
+                            if (keyedItemInfos == null)
                             {
-                                newLoopsBackLater = true;
-                                break;
+                                keyedItemInfos = BuildKeyToInfoLookup(diffContext, oldStartIndex, oldEndIndexExcl, newStartIndex, newEndIndexExcl);
                             }
-                        }
 
-                        // If the new sequence loops back later to an earlier point than this,
-                        // then we know it's part of the existing loop block (so should be inserted).
-                        // If not, then it's unrelated to the previous loop block (so we should treat
-                        // the old items as trailing loop blocks to be removed).
-                        treatAsInsert = newLoopsBackLater;
+                            var oldKeyItemInfo = oldKey != null ? keyedItemInfos[oldKey] : new KeyedItemInfo(-1, -1, false);
+                            var newKeyItemInfo = newKey != null ? keyedItemInfos[newKey] : new KeyedItemInfo(-1, -1, false);
+                            var oldKeyIsInNewTree = oldKeyItemInfo.NewIndex >= 0 && oldKeyItemInfo.IsUnique;
+                            var newKeyIsInOldTree = newKeyItemInfo.OldIndex >= 0 && newKeyItemInfo.IsUnique;
+
+                            // If either key is not in the other tree, we can handle it as an insert or a delete
+                            // on this iteration. We're only forced to use the move logic that's not the case
+                            // (i.e., both keys are in both trees)
+                            if (oldKeyIsInNewTree && newKeyIsInOldTree)
+                            {
+                                // It's a move
+                                // Since the recipient of the diff script already has the old frame (the one with oldKey)
+                                // at the current siblingIndex, recurse into oldKey and update its descendants in place.
+                                // We re-order the frames afterwards.
+                                action = DiffAction.Match;
+                                matchWithNewTreeIndex = oldKeyItemInfo.NewIndex;
+
+                                // Track the post-edit sibling indices of the moved items
+                                // Since diffContext.SiblingIndex only increases, we can be sure the values we
+                                // write at this point will remain correct, because there won't be any further
+                                // insertions/deletions at smaller sibling indices.
+                                keyedItemInfos[oldKey] = oldKeyItemInfo.WithOldSiblingIndex(diffContext.SiblingIndex);
+                                keyedItemInfos[newKey] = newKeyItemInfo.WithNewSiblingIndex(diffContext.SiblingIndex);
+                            }
+                            else if (!hasMoreNew)
+                            {
+                                // If we've run out of new items, we must be looking at just an old item, so delete it
+                                action = DiffAction.Delete;
+                            }
+                            else
+                            {
+                                // It's an insertion or a deletion, or both
+                                // If the new key is in both trees, but the old key isn't, then the old item was deleted
+                                // Otherwise, it's either an insertion or *both* insertion+deletion, so pick insertion and get the deletion on the next iteration if needed
+                                action = newKeyIsInOldTree ? DiffAction.Delete : DiffAction.Insert;
+                            }
+                        }
+                        #endregion
                     }
                     else
                     {
-                        // New sequence looped back but old one didn't
-                        // The old sequence either has some extra trailing elements in the current loop block
-                        // which we should delete, or the new sequence has extra trailing loop blocks which we
-                        // should insert
-                        // TODO: Find a way of not recomputing this next flag on every iteration
-                        var oldLoopsBackLater = false;
-                        for (var testIndex = oldStartIndex + 1; testIndex < oldEndIndexExcl; testIndex++)
+                        #region "Get diff action by matching on sequence number"
+                        // Neither side is keyed, so match by sequence number
+                        if (oldSeq == newSeq)
                         {
-                            if (oldTree[testIndex].Sequence < oldSeq)
+                            // Sequences match
+                            action = DiffAction.Match;
+                            matchWithNewTreeIndex = newStartIndex;
+                        }
+                        else
+                        {
+                            // Sequences don't match
+                            var oldLoopedBack = oldSeq <= prevOldSeq;
+                            var newLoopedBack = newSeq <= prevNewSeq;
+                            if (oldLoopedBack == newLoopedBack)
                             {
-                                oldLoopsBackLater = true;
-                                break;
+                                // Both sequences are proceeding through the same loop block, so do a simple
+                                // preordered merge join (picking from whichever side brings us closer to being
+                                // back in sync)
+                                action = newSeq < oldSeq ? DiffAction.Insert : DiffAction.Delete;
+
+                                if (oldLoopedBack)
+                                {
+                                    // If both old and new have now looped back, we must reset their 'looped back'
+                                    // tracker so we can treat them as proceeding through the same loop block
+                                    prevOldSeq = -1;
+                                    prevNewSeq = -1;
+                                }
+                            }
+                            else if (oldLoopedBack)
+                            {
+                                // Old sequence looped back but new one didn't
+                                // The new sequence either has some extra trailing elements in the current loop block
+                                // which we should insert, or omits some old trailing loop blocks which we should delete
+                                // TODO: Find a way of not recomputing this next flag on every iteration
+                                var newLoopsBackLater = false;
+                                for (var testIndex = newStartIndex + 1; testIndex < newEndIndexExcl; testIndex++)
+                                {
+                                    if (newTree[testIndex].Sequence < newSeq)
+                                    {
+                                        newLoopsBackLater = true;
+                                        break;
+                                    }
+                                }
+
+                                // If the new sequence loops back later to an earlier point than this,
+                                // then we know it's part of the existing loop block (so should be inserted).
+                                // If not, then it's unrelated to the previous loop block (so we should treat
+                                // the old items as trailing loop blocks to be removed).
+                                action = newLoopsBackLater ? DiffAction.Insert : DiffAction.Delete;
+                            }
+                            else
+                            {
+                                // New sequence looped back but old one didn't
+                                // The old sequence either has some extra trailing elements in the current loop block
+                                // which we should delete, or the new sequence has extra trailing loop blocks which we
+                                // should insert
+                                // TODO: Find a way of not recomputing this next flag on every iteration
+                                var oldLoopsBackLater = false;
+                                for (var testIndex = oldStartIndex + 1; testIndex < oldEndIndexExcl; testIndex++)
+                                {
+                                    if (oldTree[testIndex].Sequence < oldSeq)
+                                    {
+                                        oldLoopsBackLater = true;
+                                        break;
+                                    }
+                                }
+
+                                // If the old sequence loops back later to an earlier point than this,
+                                // then we know it's part of the existing loop block (so should be removed).
+                                // If not, then it's unrelated to the previous loop block (so we should treat
+                                // the new items as trailing loop blocks to be inserted).
+                                action = oldLoopsBackLater ? DiffAction.Delete : DiffAction.Insert;
                             }
                         }
+                        #endregion
+                    }
 
-                        // If the old sequence loops back later to an earlier point than this,
-                        // then we know it's part of the existing loop block (so should be removed).
-                        // If not, then it's unrelated to the previous loop block (so we should treat
-                        // the new items as trailing loop blocks to be inserted).
-                        treatAsInsert = !oldLoopsBackLater;
+                    #region "Apply diff action"
+                    switch (action)
+                    {
+                        case DiffAction.Match:
+                            AppendDiffEntriesForFramesWithSameSequence(ref diffContext, oldStartIndex, matchWithNewTreeIndex);
+                            oldStartIndex = NextSiblingIndex(oldTree[oldStartIndex], oldStartIndex);
+                            newStartIndex = NextSiblingIndex(newTree[newStartIndex], newStartIndex);
+                            hasMoreOld = oldEndIndexExcl > oldStartIndex;
+                            hasMoreNew = newEndIndexExcl > newStartIndex;
+                            prevOldSeq = oldSeq;
+                            prevNewSeq = newSeq;
+                            break;
+                        case DiffAction.Insert:
+                            InsertNewFrame(ref diffContext, newStartIndex);
+                            newStartIndex = NextSiblingIndex(newTree[newStartIndex], newStartIndex);
+                            hasMoreNew = newEndIndexExcl > newStartIndex;
+                            prevNewSeq = newSeq;
+                            break;
+                        case DiffAction.Delete:
+                            RemoveOldFrame(ref diffContext, oldStartIndex);
+                            oldStartIndex = NextSiblingIndex(oldTree[oldStartIndex], oldStartIndex);
+                            hasMoreOld = oldEndIndexExcl > oldStartIndex;
+                            prevOldSeq = oldSeq;
+                            break;
                     }
+                    #endregion
+                }
 
-                    if (treatAsInsert)
+                #region "Write permutations list"
+                if (keyedItemInfos != null)
+                {
+                    var hasPermutations = false;
+                    foreach (var keyValuePair in keyedItemInfos)
                     {
-                        InsertNewFrame(ref diffContext, newStartIndex);
-                        newStartIndex = NextSiblingIndex(newTree[newStartIndex], newStartIndex);
-                        hasMoreNew = newEndIndexExcl > newStartIndex;
-                        prevNewSeq = newSeq;
+                        var value = keyValuePair.Value;
+                        if (value.OldSiblingIndex >= 0 && value.NewSiblingIndex >= 0)
+                        {
+                            // This item moved
+                            hasPermutations = true;
+                            diffContext.Edits.Append(
+                                RenderTreeEdit.PermutationListEntry(value.OldSiblingIndex, value.NewSiblingIndex));
+                        }
                     }
-                    else
+
+                    if (hasPermutations)
                     {
-                        RemoveOldFrame(ref diffContext, oldStartIndex);
-                        oldStartIndex = NextSiblingIndex(oldTree[oldStartIndex], oldStartIndex);
-                        hasMoreOld = oldEndIndexExcl > oldStartIndex;
-                        prevOldSeq = oldSeq;
+                        // It's much easier for the recipient to handle if we're explicit about
+                        // when the list is finished
+                        diffContext.Edits.Append(RenderTreeEdit.PermutationListEnd());
                     }
                 }
+                #endregion
+            }
+            finally
+            {
+                if (keyedItemInfos != null)
+                {
+                    keyedItemInfos.Clear();
+                    diffContext.KeyedItemInfoDictionaryPool.Return(keyedItemInfos);
+                }
+            }
+        }
+
+        private static Dictionary<object, KeyedItemInfo> BuildKeyToInfoLookup(DiffContext diffContext, int oldStartIndex, int oldEndIndexExcl, int newStartIndex, int newEndIndexExcl)
+        {
+            var result = diffContext.KeyedItemInfoDictionaryPool.Get();
+            var oldTree = diffContext.OldTree;
+            var newTree = diffContext.NewTree;
+
+            while (oldStartIndex < oldEndIndexExcl)
+            {
+                ref var frame = ref oldTree[oldStartIndex];
+                var key = KeyValue(ref frame);
+                if (key != null)
+                {
+                    result[key] = new KeyedItemInfo(oldStartIndex, -1, isUnique: !result.ContainsKey(key));
+                }
+
+                oldStartIndex = NextSiblingIndex(frame, oldStartIndex);
+            }
+
+            while (newStartIndex < newEndIndexExcl)
+            {
+                ref var frame = ref newTree[newStartIndex];
+                var key = KeyValue(ref frame);
+                if (key != null)
+                {
+                    result[key] = result.TryGetValue(key, out var existingEntry)
+                        ? new KeyedItemInfo(existingEntry.OldIndex, newStartIndex, isUnique: existingEntry.NewIndex < 0)
+                        : new KeyedItemInfo(-1, newStartIndex, isUnique: true);
+                }
+
+                newStartIndex = NextSiblingIndex(frame, newStartIndex);
+            }
+
+            return result;
+        }
+
+        private static object KeyValue(ref RenderTreeFrame frame)
+        {
+            switch (frame.FrameType)
+            {
+                case RenderTreeFrameType.Element:
+                    return frame.ElementKey;
+                case RenderTreeFrameType.Component:
+                    return frame.ComponentKey;
+                default:
+                    return null;
             }
         }
 
@@ -315,11 +511,21 @@ private static void AppendDiffEntriesForFramesWithSameSequence(
             ref var oldFrame = ref oldTree[oldFrameIndex];
             ref var newFrame = ref newTree[newFrameIndex];
 
+            // This can't happen for sequence-matched frames from .razor components, but it can happen if you write your
+            // builder logic manually or if two dissimilar frames matched by key. Treat as completely unrelated.
+            var newFrameType = newFrame.FrameType;
+            if (oldFrame.FrameType != newFrameType)
+            {
+                InsertNewFrame(ref diffContext, newFrameIndex);
+                RemoveOldFrame(ref diffContext, oldFrameIndex);
+                return;
+            }
+
             // We can assume that the old and new frames are of the same type, because they correspond
             // to the same sequence number (and if not, the behaviour is undefined).
             // TODO: Consider supporting dissimilar types at same sequence for custom IComponent implementations.
             //       It should only be a matter of calling RemoveOldFrame+InsertNewFrame
-            switch (newFrame.FrameType)
+            switch (newFrameType)
             {
                 case RenderTreeFrameType.Text:
                     {
@@ -718,6 +924,7 @@ private struct DiffContext
             public readonly ArrayBuilder<RenderTreeEdit> Edits;
             public readonly ArrayBuilder<RenderTreeFrame> ReferenceFrames;
             public readonly Dictionary<string, int> AttributeDiffSet;
+            public readonly StackObjectPool<Dictionary<object, KeyedItemInfo>> KeyedItemInfoDictionaryPool;
             public readonly int ComponentId;
             public int SiblingIndex;
 
@@ -736,6 +943,7 @@ public DiffContext(
                 Edits = batchBuilder.EditsBuffer;
                 ReferenceFrames = batchBuilder.ReferenceFramesBuffer;
                 AttributeDiffSet = batchBuilder.AttributeDiffSet;
+                KeyedItemInfoDictionaryPool = batchBuilder.KeyedItemInfoDictionaryPool;
                 SiblingIndex = 0;
             }
         }
diff --git a/src/Components/Components/src/RenderTree/RenderTreeEdit.cs b/src/Components/Components/src/RenderTree/RenderTreeEdit.cs
index d7c0daa7b160..96f661924bbb 100644
--- a/src/Components/Components/src/RenderTree/RenderTreeEdit.cs
+++ b/src/Components/Components/src/RenderTree/RenderTreeEdit.cs
@@ -1,37 +1,47 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System;
+using System.Runtime.InteropServices;
 
 namespace Microsoft.AspNetCore.Components.RenderTree
 {
     /// <summary>
     /// Represents a single edit operation on a component's render tree.
     /// </summary>
+    [StructLayout(LayoutKind.Explicit)]
     public readonly struct RenderTreeEdit
     {
         /// <summary>
         /// Gets the type of the edit operation.
         /// </summary>
-        public readonly RenderTreeEditType Type;
+        [FieldOffset(0)] public readonly RenderTreeEditType Type;
 
         /// <summary>
         /// Gets the index of the sibling frame that the edit relates to.
         /// </summary>
-        public readonly int SiblingIndex;
+        [FieldOffset(4)] public readonly int SiblingIndex;
 
         /// <summary>
         /// Gets the index of related data in an associated render frames array. For example, if the
         /// <see cref="Type"/> value is <see cref="RenderTreeEditType.PrependFrame"/>, gets the
         /// index of the new frame data in an associated render tree.
         /// </summary>
-        public readonly int ReferenceFrameIndex;
+        [FieldOffset(8)] public readonly int ReferenceFrameIndex;
+
+        /// <summary>
+        /// If the <see cref="Type"/> value is <see cref="RenderTreeEditType.PermutationListEntry"/>,
+        /// gets the sibling index to which the frame should be moved.
+        /// </summary>
+        // NOTE: Other code relies on the assumption that ReferenceFrameIndex and
+        // MoveToSiblingIndex share a memory slot. If you change this, be sure to
+        // update affected usages of ReferenceFrameIndex.
+        [FieldOffset(8)] public readonly int MoveToSiblingIndex;
 
         /// <summary>
         /// If the <see cref="Type"/> value is <see cref="RenderTreeEditType.RemoveAttribute"/>,
         /// gets the name of the attribute that is being removed.
         /// </summary>
-        public readonly string RemovedAttributeName;
+        [FieldOffset(16)] public readonly string RemovedAttributeName;
 
         private RenderTreeEdit(RenderTreeEditType type) : this()
         {
@@ -44,11 +54,14 @@ private RenderTreeEdit(RenderTreeEditType type, int siblingIndex) : this()
             SiblingIndex = siblingIndex;
         }
 
-        private RenderTreeEdit(RenderTreeEditType type, int siblingIndex, int referenceFrameIndex) : this()
+        private RenderTreeEdit(RenderTreeEditType type, int siblingIndex, int referenceFrameOrMoveToSiblingIndex) : this()
         {
             Type = type;
             SiblingIndex = siblingIndex;
-            ReferenceFrameIndex = referenceFrameIndex;
+
+            // MoveToSiblingIndex is stored in the same slot as ReferenceFrameIndex,
+            // so assigning to either one is equivalent
+            ReferenceFrameIndex = referenceFrameOrMoveToSiblingIndex;
         }
 
         private RenderTreeEdit(RenderTreeEditType type, int siblingIndex, string removedAttributeName) : this()
@@ -81,5 +94,11 @@ internal static RenderTreeEdit StepIn(int siblingIndex)
 
         internal static RenderTreeEdit StepOut()
             => new RenderTreeEdit(RenderTreeEditType.StepOut);
+
+        internal static RenderTreeEdit PermutationListEntry(int fromSiblingIndex, int toSiblingIndex)
+            => new RenderTreeEdit(RenderTreeEditType.PermutationListEntry, fromSiblingIndex, toSiblingIndex);
+
+        internal static RenderTreeEdit PermutationListEnd()
+            => new RenderTreeEdit(RenderTreeEditType.PermutationListEnd);
     }
 }
diff --git a/src/Components/Components/src/RenderTree/RenderTreeEditType.cs b/src/Components/Components/src/RenderTree/RenderTreeEditType.cs
index aa7ca3a60428..c2f3e4aba692 100644
--- a/src/Components/Components/src/RenderTree/RenderTreeEditType.cs
+++ b/src/Components/Components/src/RenderTree/RenderTreeEditType.cs
@@ -51,5 +51,18 @@ public enum RenderTreeEditType: int
         /// should be updated.
         /// </summary>
         UpdateMarkup = 8,
+
+        /// <summary>
+        /// An entry in a sparse permutation list. That is, a list of old indices with
+        /// corresponding new indices, which altogether describe a valid permutation of
+        /// the children at the current edit position.
+        /// </summary>
+        PermutationListEntry = 9,
+
+        /// <summary>
+        /// Indicates that the preceding series of <see cref="PermutationListEntry"/> entries
+        /// is now complete.
+        /// </summary>
+        PermutationListEnd = 10,
     }
 }
diff --git a/src/Components/Components/src/RenderTree/RenderTreeFrame.cs b/src/Components/Components/src/RenderTree/RenderTreeFrame.cs
index 920d0752bb5f..7bf18c150dea 100644
--- a/src/Components/Components/src/RenderTree/RenderTreeFrame.cs
+++ b/src/Components/Components/src/RenderTree/RenderTreeFrame.cs
@@ -3,7 +3,6 @@
 
 using System;
 using System.Runtime.InteropServices;
-using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Rendering;
 
 namespace Microsoft.AspNetCore.Components.RenderTree
@@ -17,13 +16,22 @@ public readonly struct RenderTreeFrame
         // Note that the struct layout has to be valid in both 32-bit and 64-bit runtime platforms,
         // which means that all reference-type fields need to take up 8 bytes (except for the last
         // one, which will be sized as either 4 or 8 bytes depending on the runtime platform).
-        // This is not optimal for the Mono-WebAssembly case because that's always 32-bit so the
-        // reference-type fields could be reduced to 4 bytes each. We could use ifdefs to have
-        // different fields offsets for the 32 and 64 bit compile targets, but then we'd have the
-        // complexity of needing different binaries when loaded into Mono-WASM vs desktop.
-        // Eventually we might stop using this shared memory interop altogether (and would have to
-        // if running as a web worker) so for now to keep things simple, treat reference types as
-        // 8 bytes here.
+
+        // Although each frame type uses the slots for different purposes, the runtime does not
+        // allow reference type slots to overlap with each other or with value-type slots.
+        // Here's the current layout:
+        //
+        // Offset   Type
+        // ------   ----
+        // 0-3      Int32 (sequence number)
+        // 4-7      Int32 (frame type)
+        // 8-15     Value types (usage varies by frame type)
+        // 16-23    Reference type (usage varies by frame type)
+        // 24-31    Reference type (usage varies by frame type)
+        // 32-39    Reference type (usage varies by frame type)
+        //
+        // On Mono WebAssembly, because it's 32-bit, the final slot occupies bytes 32-35,
+        // so the struct length is only 36.
 
         // --------------------------------------------------------------------------------
         // Common
@@ -58,6 +66,12 @@ public readonly struct RenderTreeFrame
         /// </summary>
         [FieldOffset(16)] public readonly string ElementName;
 
+        /// <summary>
+        /// If the <see cref="FrameType"/> property equals <see cref="RenderTreeFrameType.Element"/>,
+        /// gets the element's diffing key, or null if none was specified.
+        /// </summary>
+        [FieldOffset(24)] public readonly object ElementKey;
+
         // --------------------------------------------------------------------------------
         // RenderTreeFrameType.Text
         // --------------------------------------------------------------------------------
@@ -119,6 +133,12 @@ public readonly struct RenderTreeFrame
         /// </summary>
         [FieldOffset(24)] internal readonly ComponentState ComponentState;
 
+        /// <summary>
+        /// If the <see cref="FrameType"/> property equals <see cref="RenderTreeFrameType.Component"/>,
+        /// gets the component's diffing key, or null if none was specified.
+        /// </summary>
+        [FieldOffset(32)] public readonly object ComponentKey;
+
         /// <summary>
         /// If the <see cref="FrameType"/> property equals <see cref="RenderTreeFrameType.Component"/>,
         /// gets the child component instance. Otherwise, the value is undefined.
@@ -184,66 +204,72 @@ public readonly struct RenderTreeFrame
         /// </summary>
         [FieldOffset(16)] public readonly string MarkupContent;
 
-        private RenderTreeFrame(int sequence, string elementName, int elementSubtreeLength)
+        // Element constructor
+        private RenderTreeFrame(int sequence, int elementSubtreeLength, string elementName, object elementKey)
             : this()
         {
-            FrameType = RenderTreeFrameType.Element;
             Sequence = sequence;
-            ElementName = elementName;
+            FrameType = RenderTreeFrameType.Element;
             ElementSubtreeLength = elementSubtreeLength;
+            ElementName = elementName;
+            ElementKey = elementKey;
         }
 
-        private RenderTreeFrame(int sequence, Type componentType, int componentSubtreeLength)
+        // Component constructor
+        private RenderTreeFrame(int sequence, int componentSubtreeLength, Type componentType, ComponentState componentState, object componentKey)
             : this()
         {
-            FrameType = RenderTreeFrameType.Component;
             Sequence = sequence;
-            ComponentType = componentType;
+            FrameType = RenderTreeFrameType.Component;
             ComponentSubtreeLength = componentSubtreeLength;
-        }
+            ComponentType = componentType;
+            ComponentKey = componentKey;
 
-        private RenderTreeFrame(int sequence, Type componentType, int subtreeLength, ComponentState componentState)
-            : this(sequence, componentType, subtreeLength)
-        {
-            ComponentId = componentState.ComponentId;
-            ComponentState = componentState;
+            if (componentState != null)
+            {
+                ComponentState = componentState;
+                ComponentId = componentState.ComponentId;
+            }
         }
 
-        private RenderTreeFrame(int sequence, string textContent)
+        // Region constructor
+        private RenderTreeFrame(int sequence, int regionSubtreeLength)
             : this()
         {
-            FrameType = RenderTreeFrameType.Text;
             Sequence = sequence;
-            TextContent = textContent;
+            FrameType = RenderTreeFrameType.Region;
+            RegionSubtreeLength = regionSubtreeLength;
         }
 
-        private RenderTreeFrame(int sequence, string attributeName, object attributeValue)
+        // Text/markup constructor
+        private RenderTreeFrame(int sequence, bool isMarkup, string textOrMarkup)
             : this()
         {
-            FrameType = RenderTreeFrameType.Attribute;
             Sequence = sequence;
-            AttributeName = attributeName;
-            AttributeValue = attributeValue;
+            if (isMarkup)
+            {
+                FrameType = RenderTreeFrameType.Markup;
+                MarkupContent = textOrMarkup;
+            }
+            else
+            {
+                FrameType = RenderTreeFrameType.Text;
+                TextContent = textOrMarkup;
+            }
         }
 
-        private RenderTreeFrame(int sequence, string attributeName, object attributeValue, int eventHandlerId)
+        // Attribute constructor
+        private RenderTreeFrame(int sequence, string attributeName, object attributeValue, int attributeEventHandlerId)
             : this()
         {
             FrameType = RenderTreeFrameType.Attribute;
             Sequence = sequence;
             AttributeName = attributeName;
             AttributeValue = attributeValue;
-            AttributeEventHandlerId = eventHandlerId;
-        }
-
-        private RenderTreeFrame(int sequence, int regionSubtreeLength)
-            : this()
-        {
-            FrameType = RenderTreeFrameType.Region;
-            Sequence = sequence;
-            RegionSubtreeLength = regionSubtreeLength;
+            AttributeEventHandlerId = attributeEventHandlerId;
         }
 
+        // Element reference capture constructor
         private RenderTreeFrame(int sequence, Action<ElementRef> elementReferenceCaptureAction, string elementReferenceCaptureId)
             : this()
         {
@@ -253,6 +279,7 @@ private RenderTreeFrame(int sequence, Action<ElementRef> elementReferenceCapture
             ElementReferenceCaptureId = elementReferenceCaptureId;
         }
 
+        // Component reference capture constructor
         private RenderTreeFrame(int sequence, Action<object> componentReferenceCaptureAction, int parentFrameIndex)
             : this()
         {
@@ -262,36 +289,23 @@ private RenderTreeFrame(int sequence, Action<object> componentReferenceCaptureAc
             ComponentReferenceCaptureParentFrameIndex = parentFrameIndex;
         }
 
-        // If we need further constructors whose signatures clash with the patterns above,
-        // we can add extra args to this general-purpose one.
-        private RenderTreeFrame(int sequence, RenderTreeFrameType frameType, string markupContent)
-            : this()
-        {
-            FrameType = frameType;
-            Sequence = sequence;
-            MarkupContent = markupContent;
-        }
-
         internal static RenderTreeFrame Element(int sequence, string elementName)
-            => new RenderTreeFrame(sequence, elementName: elementName, elementSubtreeLength: 0);
+            => new RenderTreeFrame(sequence, elementSubtreeLength: 0, elementName, null);
 
         internal static RenderTreeFrame Text(int sequence, string textContent)
-            => new RenderTreeFrame(sequence, textContent: textContent);
+            => new RenderTreeFrame(sequence, isMarkup: false, textOrMarkup: textContent);
 
         internal static RenderTreeFrame Markup(int sequence, string markupContent)
-            => new RenderTreeFrame(sequence, RenderTreeFrameType.Markup, markupContent);
-
-        internal static RenderTreeFrame Attribute(int sequence, string name, MulticastDelegate value)
-             => new RenderTreeFrame(sequence, attributeName: name, attributeValue: value);
+            => new RenderTreeFrame(sequence, isMarkup: true, textOrMarkup: markupContent);
 
         internal static RenderTreeFrame Attribute(int sequence, string name, object value)
-            => new RenderTreeFrame(sequence, attributeName: name, attributeValue: value);
+            => new RenderTreeFrame(sequence, attributeName: name, attributeValue: value, attributeEventHandlerId: 0);
 
         internal static RenderTreeFrame ChildComponent(int sequence, Type componentType)
-            => new RenderTreeFrame(sequence, componentType, 0);
+            => new RenderTreeFrame(sequence, componentSubtreeLength: 0, componentType, null, null);
 
         internal static RenderTreeFrame PlaceholderChildComponentWithSubtreeLength(int subtreeLength)
-            => new RenderTreeFrame(0, typeof(IComponent), subtreeLength);
+            => new RenderTreeFrame(0, componentSubtreeLength: subtreeLength, typeof(IComponent), null, null);
 
         internal static RenderTreeFrame Region(int sequence)
             => new RenderTreeFrame(sequence, regionSubtreeLength: 0);
@@ -303,25 +317,31 @@ internal static RenderTreeFrame ComponentReferenceCapture(int sequence, Action<o
             => new RenderTreeFrame(sequence, componentReferenceCaptureAction: componentReferenceCaptureAction, parentFrameIndex: parentFrameIndex);
 
         internal RenderTreeFrame WithElementSubtreeLength(int elementSubtreeLength)
-            => new RenderTreeFrame(Sequence, elementName: ElementName, elementSubtreeLength: elementSubtreeLength);
+            => new RenderTreeFrame(Sequence, elementSubtreeLength: elementSubtreeLength, ElementName, ElementKey);
 
         internal RenderTreeFrame WithComponentSubtreeLength(int componentSubtreeLength)
-            => new RenderTreeFrame(Sequence, componentType: ComponentType, componentSubtreeLength: componentSubtreeLength);
+            => new RenderTreeFrame(Sequence, componentSubtreeLength: componentSubtreeLength, ComponentType, ComponentState, ComponentKey);
 
         internal RenderTreeFrame WithAttributeSequence(int sequence)
-            => new RenderTreeFrame(sequence, attributeName: AttributeName, attributeValue: AttributeValue);
+            => new RenderTreeFrame(sequence, attributeName: AttributeName, AttributeValue, AttributeEventHandlerId);
 
         internal RenderTreeFrame WithComponent(ComponentState componentState)
-            => new RenderTreeFrame(Sequence, ComponentType, ComponentSubtreeLength, componentState);
+            => new RenderTreeFrame(Sequence, componentSubtreeLength: ComponentSubtreeLength, ComponentType, componentState, ComponentKey);
 
         internal RenderTreeFrame WithAttributeEventHandlerId(int eventHandlerId)
-            => new RenderTreeFrame(Sequence, AttributeName, AttributeValue, eventHandlerId);
+            => new RenderTreeFrame(Sequence, attributeName: AttributeName, AttributeValue, eventHandlerId);
 
         internal RenderTreeFrame WithRegionSubtreeLength(int regionSubtreeLength)
             => new RenderTreeFrame(Sequence, regionSubtreeLength: regionSubtreeLength);
 
         internal RenderTreeFrame WithElementReferenceCaptureId(string elementReferenceCaptureId)
-            => new RenderTreeFrame(Sequence, ElementReferenceCaptureAction, elementReferenceCaptureId);
+            => new RenderTreeFrame(Sequence, elementReferenceCaptureAction: ElementReferenceCaptureAction, elementReferenceCaptureId);
+
+        internal RenderTreeFrame WithElementKey(object elementKey)
+            => new RenderTreeFrame(Sequence, elementSubtreeLength: ElementSubtreeLength, ElementName, elementKey);
+
+        internal RenderTreeFrame WithComponentKey(object componentKey)
+            => new RenderTreeFrame(Sequence, componentSubtreeLength: ComponentSubtreeLength, ComponentType, ComponentState, componentKey);
 
         /// <inheritdoc />
         // Just to be nice for debugging and unit tests.
@@ -333,10 +353,10 @@ public override string ToString()
                     return $"Attribute: (seq={Sequence}, id={AttributeEventHandlerId}) '{AttributeName}'='{AttributeValue}'";
 
                 case RenderTreeFrameType.Component:
-                    return $"Component: (seq={Sequence}, len={ComponentSubtreeLength}) {ComponentType}";
+                    return $"Component: (seq={Sequence}, key={ComponentKey ?? "(none)"}, len={ComponentSubtreeLength}) {ComponentType}";
 
                 case RenderTreeFrameType.Element:
-                    return $"Element: (seq={Sequence}, len={ElementSubtreeLength}) {ElementName}";
+                    return $"Element: (seq={Sequence}, key={ElementKey ?? "(none)"}, len={ElementSubtreeLength}) {ElementName}";
 
                 case RenderTreeFrameType.Region:
                     return $"Region: (seq={Sequence}, len={RegionSubtreeLength})";
diff --git a/src/Components/Components/src/RenderTree/StackObjectPool.cs b/src/Components/Components/src/RenderTree/StackObjectPool.cs
new file mode 100644
index 000000000000..a2c9c1f5241b
--- /dev/null
+++ b/src/Components/Components/src/RenderTree/StackObjectPool.cs
@@ -0,0 +1,75 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+
+namespace Microsoft.AspNetCore.Components.RenderTree
+{
+    // This is a very simple object pool that requires Get and Return calls to be
+    // balanced as in a stack. It retains up to 'maxPreservedItems' instances in
+    // memory, then for any further requests it supplies untracked instances.
+
+    internal class StackObjectPool<T> where T : class
+    {
+        private readonly int _maxPreservedItems;
+        private readonly Func<T> _instanceFactory;
+        private readonly T[] _contents;
+        private int _numSuppliedItems;
+        private int _numTrackedItems;
+
+        public StackObjectPool(int maxPreservedItems, Func<T> instanceFactory)
+        {
+            _maxPreservedItems = maxPreservedItems;
+            _instanceFactory = instanceFactory ?? throw new ArgumentNullException(nameof(instanceFactory));
+            _contents = new T[_maxPreservedItems];
+        }
+
+        public T Get()
+        {
+            _numSuppliedItems++;
+
+            if (_numSuppliedItems <= _maxPreservedItems)
+            {
+                if (_numTrackedItems < _numSuppliedItems)
+                {
+                    // Need to allocate a new one
+                    var newItem = _instanceFactory();
+                    _contents[_numTrackedItems++] = newItem;
+                    return newItem;
+                }
+                else
+                {
+                    // Can use one that's already in the pool
+                    return _contents[_numSuppliedItems - 1];
+                }
+            }
+            else
+            {
+                // Pool is full; return untracked instance
+                return _instanceFactory();
+            }
+        }
+
+        public void Return(T instance)
+        {
+            if (_numSuppliedItems <= 0)
+            {
+                throw new InvalidOperationException("There are no outstanding instances to return.");
+            }
+            else if (_numSuppliedItems <= _maxPreservedItems)
+            {
+                // We check you're returning the right instance only as a way of
+                // catching Get/Return mismatch bugs
+                var expectedInstance = _contents[_numSuppliedItems - 1];
+                if (!ReferenceEquals(instance, expectedInstance))
+                {
+                    throw new ArgumentException($"Attempting to return wrong pooled instance. {nameof(Get)}/{nameof(Return)} calls must form a stack.");
+                }
+            }
+
+            // It's a valid call. Track that we're no longer "supplying" the top item,
+            // but keep the instance in the _contents array for future reuse.
+            _numSuppliedItems--;
+        }
+    }
+}
diff --git a/src/Components/Components/src/Rendering/KeyedItemInfo.cs b/src/Components/Components/src/Rendering/KeyedItemInfo.cs
new file mode 100644
index 000000000000..f2a56341e2bb
--- /dev/null
+++ b/src/Components/Components/src/Rendering/KeyedItemInfo.cs
@@ -0,0 +1,46 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+namespace Microsoft.AspNetCore.Components.Rendering
+{
+    // Used internally during diffing to track what we know about keyed items and their positions
+    internal readonly struct KeyedItemInfo
+    {
+        public readonly int OldIndex;
+        public readonly int NewIndex;
+        public readonly int OldSiblingIndex;
+        public readonly int NewSiblingIndex;
+        public readonly bool IsUnique;
+
+        public KeyedItemInfo(int oldIndex, int newIndex, bool isUnique)
+        {
+            OldIndex = oldIndex;
+            NewIndex = newIndex;
+            OldSiblingIndex = -1;
+            NewSiblingIndex = -1;
+
+            // Non-unique keys are problematic, because there's no way to know which instance
+            // should match with which other, plus they would force us to keep track of which
+            // usages have been consumed as we proceed through the diff. Since this is such
+            // an edge case, we "tolerate" it just by tracking which keys have duplicates, and
+            // for those ones, we never treat them as moved. Instead for those we fall back on
+            // insert+delete behavior, i.e., not preserving elements/components.
+            //
+            // Guidance for developers is therefore to use distinct keys.
+            IsUnique = isUnique;
+        }
+
+        private KeyedItemInfo(in KeyedItemInfo copyFrom, int oldSiblingIndex, int newSiblingIndex)
+        {
+            this = copyFrom;
+            OldSiblingIndex = oldSiblingIndex;
+            NewSiblingIndex = newSiblingIndex;
+        }
+
+        public KeyedItemInfo WithOldSiblingIndex(int oldSiblingIndex)
+            => new KeyedItemInfo(this, oldSiblingIndex, NewSiblingIndex);
+
+        public KeyedItemInfo WithNewSiblingIndex(int newSiblingIndex)
+            => new KeyedItemInfo(this, OldSiblingIndex, newSiblingIndex);
+    }
+}
diff --git a/src/Components/Components/src/Rendering/RenderBatchBuilder.cs b/src/Components/Components/src/Rendering/RenderBatchBuilder.cs
index 4bcdd82d0aaf..bb5daacec41b 100644
--- a/src/Components/Components/src/Rendering/RenderBatchBuilder.cs
+++ b/src/Components/Components/src/Rendering/RenderBatchBuilder.cs
@@ -30,6 +30,9 @@ internal class RenderBatchBuilder
         // Scratch data structure for understanding attribute diffs.
         public Dictionary<string, int> AttributeDiffSet { get; } = new Dictionary<string, int>();
 
+        internal StackObjectPool<Dictionary<object, KeyedItemInfo>> KeyedItemInfoDictionaryPool { get; }
+            = new StackObjectPool<Dictionary<object, KeyedItemInfo>>(maxPreservedItems: 10, () => new Dictionary<object, KeyedItemInfo>());
+
         public void ClearStateForCurrentBatch()
         {
             // This method is used to reset the builder back to a default state so it can
diff --git a/src/Components/Components/test/RenderTreeBuilderTest.cs b/src/Components/Components/test/RenderTreeBuilderTest.cs
index 75a7616b1e70..ac05e9b195b0 100644
--- a/src/Components/Components/test/RenderTreeBuilderTest.cs
+++ b/src/Components/Components/test/RenderTreeBuilderTest.cs
@@ -1047,6 +1047,107 @@ public void AddAttribute_Element_ObjectNull_IgnoresFrame()
                 frame => AssertFrame.Element(frame, "elem", 1, 0));
         }
 
+        [Fact]
+        public void CanAddKeyToElement()
+        {
+            // Arrange
+            var builder = new RenderTreeBuilder(new TestRenderer());
+            var keyValue = new object();
+
+            // Act
+            builder.OpenElement(0, "elem");
+            builder.AddAttribute(1, "attribute before", "before value");
+            builder.SetKey(keyValue);
+            builder.AddAttribute(2, "attribute after", "after value");
+            builder.CloseElement();
+
+            // Assert
+            Assert.Collection(
+                builder.GetFrames().AsEnumerable(),
+                frame =>
+                {
+                    AssertFrame.Element(frame, "elem", 3, 0);
+                    Assert.Same(keyValue, frame.ElementKey);
+                },
+                frame => AssertFrame.Attribute(frame, "attribute before", "before value", 1),
+                frame => AssertFrame.Attribute(frame, "attribute after", "after value", 2));
+        }
+
+        [Fact]
+        public void CanAddKeyToComponent()
+        {
+            // Arrange
+            var builder = new RenderTreeBuilder(new TestRenderer());
+            var keyValue = new object();
+
+            // Act
+            builder.OpenComponent<TestComponent>(0);
+            builder.AddAttribute(1, "param before", 123);
+            builder.SetKey(keyValue);
+            builder.AddAttribute(2, "param after", 456);
+            builder.CloseComponent();
+
+            // Assert
+            Assert.Collection(
+                builder.GetFrames().AsEnumerable(),
+                frame =>
+                {
+                    AssertFrame.Component<TestComponent>(frame, 3, 0);
+                    Assert.Same(keyValue, frame.ComponentKey);
+                },
+                frame => AssertFrame.Attribute(frame, "param before", 123, 1),
+                frame => AssertFrame.Attribute(frame, "param after", 456, 2));
+        }
+
+        [Fact]
+        public void CannotAddKeyOutsideComponentOrElement_TreeRoot()
+        {
+            // Arrange
+            var builder = new RenderTreeBuilder(new TestRenderer());
+
+            // Act/Assert
+            var ex = Assert.Throws<InvalidOperationException>(() =>
+            {
+                builder.SetKey(new object());
+            });
+            Assert.Equal("Cannot set a key outside the scope of a component or element.", ex.Message);
+        }
+
+        [Fact]
+        public void CannotAddKeyOutsideComponentOrElement_RegionRoot()
+        {
+            // Arrange
+            var builder = new RenderTreeBuilder(new TestRenderer());
+
+            // Act/Assert
+            builder.OpenElement(0, "some element");
+            builder.OpenRegion(1);
+            var ex = Assert.Throws<InvalidOperationException>(() =>
+            {
+                builder.SetKey(new object());
+            });
+            Assert.Equal($"Cannot set a key on a frame of type {RenderTreeFrameType.Region}.", ex.Message);
+        }
+
+        [Fact]
+        public void CannotAddNullKey()
+        {
+            // Although we could translate 'null' into either some default "null key"
+            // instance, or just no-op the call, it almost certainly indicates a programming
+            // error so it's better to fail.
+
+            // Arrange
+            var builder = new RenderTreeBuilder(new TestRenderer());
+
+            // Act/Assert
+            var ex = Assert.Throws<ArgumentNullException>(() =>
+            {
+                builder.OpenElement(0, "elem");
+                builder.SetKey(null);
+            });
+            Assert.Equal("value", ex.ParamName);
+        }
+
         private class TestComponent : IComponent
         {
             public void Configure(RenderHandle renderHandle) { }
diff --git a/src/Components/Components/test/RenderTreeDiffBuilderTest.cs b/src/Components/Components/test/RenderTreeDiffBuilderTest.cs
index caafa7c7d599..b1dff6447732 100644
--- a/src/Components/Components/test/RenderTreeDiffBuilderTest.cs
+++ b/src/Components/Components/test/RenderTreeDiffBuilderTest.cs
@@ -103,6 +103,417 @@ public void RecognizesOldItemsBeingRemoved()
                 entry => AssertEdit(entry, RenderTreeEditType.RemoveFrame, 1));
         }
 
+        [Fact]
+        public void RecognizesKeyedElementInsertions()
+        {
+            // Arrange
+            oldTree.OpenElement(0, "container");
+            oldTree.SetKey("retained key");
+            oldTree.AddContent(1, "Existing");
+            oldTree.CloseElement();
+
+            newTree.OpenElement(0, "container");
+            newTree.SetKey("new key");
+            newTree.AddContent(1, "Inserted");
+            newTree.CloseElement();
+
+            newTree.OpenElement(0, "container");
+            newTree.SetKey("retained key");
+            newTree.AddContent(1, "Existing");
+            newTree.CloseElement();
+
+            // Without the key, it would change the text "Existing" to "Inserted", then insert a new "Existing" below it
+            // With the key, it just inserts a new "Inserted" at the top
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                entry =>
+                {
+                    AssertEdit(entry, RenderTreeEditType.PrependFrame, 0);
+                    Assert.Equal(0, entry.ReferenceFrameIndex);
+                    Assert.Equal("new key", referenceFrames[entry.ReferenceFrameIndex].ElementKey);
+                });
+        }
+
+        [Fact]
+        public void RecognizesKeyedElementDeletions()
+        {
+            // Arrange
+            oldTree.OpenElement(0, "container");
+            oldTree.SetKey("will delete");
+            oldTree.AddContent(1, "First");
+            oldTree.CloseElement();
+
+            oldTree.OpenElement(0, "container");
+            oldTree.SetKey("will retain");
+            oldTree.AddContent(1, "Second");
+            oldTree.CloseElement();
+
+            newTree.OpenElement(0, "container");
+            newTree.SetKey("will retain");
+            newTree.AddContent(1, "Second");
+            newTree.CloseElement();
+
+            // Without the key, it changes the text content of "First" to "Second", then deletes the other "Second"
+            // With the key, it just deletes "First"
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                entry => AssertEdit(entry, RenderTreeEditType.RemoveFrame, 0));
+        }
+
+        [Fact]
+        public void RecognizesSimultaneousKeyedElementInsertionsAndDeletions()
+        {
+            // Arrange
+            oldTree.OpenElement(0, "container");
+            oldTree.SetKey("original key");
+            oldTree.AddContent(1, "Original");
+            oldTree.CloseElement();
+
+            newTree.OpenElement(0, "container");
+            newTree.SetKey("new key");
+            newTree.AddContent(1, "Inserted");
+            newTree.CloseElement();
+
+            // Without the key, it would change the text "Original" to "Inserted"
+            // With the key, it deletes the old element and inserts the new element
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                entry =>
+                {
+                    AssertEdit(entry, RenderTreeEditType.PrependFrame, 0);
+                    Assert.Equal(0, entry.ReferenceFrameIndex);
+                    Assert.Equal("new key", referenceFrames[entry.ReferenceFrameIndex].ElementKey);
+                },
+                entry => AssertEdit(entry, RenderTreeEditType.RemoveFrame, 1));
+        }
+
+        [Fact]
+        public void RecognizesKeyedComponentInsertions()
+        {
+            // Arrange
+            oldTree.OpenComponent<CaptureSetParametersComponent>(0);
+            oldTree.SetKey("retained key");
+            oldTree.AddAttribute(1, "ParamName", "Param old value");
+            oldTree.CloseComponent();
+            GetRenderedBatch(new RenderTreeBuilder(renderer), oldTree, false); // Assign initial IDs
+            var oldComponent = GetComponents<CaptureSetParametersComponent>(oldTree).Single();
+
+            newTree.OpenComponent<CaptureSetParametersComponent>(0);
+            newTree.SetKey("new key");
+            newTree.AddAttribute(1, "ParamName", "New component param value");
+            newTree.CloseComponent();
+
+            newTree.OpenComponent<CaptureSetParametersComponent>(0);
+            newTree.SetKey("retained key");
+            newTree.AddAttribute(1, "ParamName", "Param new value");
+            newTree.CloseComponent();
+
+            // Without the key, it would modify the param on the first component,
+            // then insert a new second component.
+            // With the key, it inserts a new first component, then modifies the
+            // param on the second component.
+
+            // Act
+            var batch = GetRenderedBatch(initializeFromFrames: false);
+            var newComponents = GetComponents<CaptureSetParametersComponent>(newTree);
+
+            // Assert: Inserts new component at position 0
+            Assert.Equal(1, batch.UpdatedComponents.Count);
+            Assert.Collection(batch.UpdatedComponents.Array[0].Edits,
+                entry => AssertEdit(entry, RenderTreeEditType.PrependFrame, 0));
+
+            // Assert: Retains old component instance in position 1, and updates its params
+            Assert.Same(oldComponent, newComponents[1]);
+            Assert.Equal(2, oldComponent.SetParametersCallCount);
+        }
+
+        [Fact]
+        public void RecognizesKeyedComponentDeletions()
+        {
+            // Arrange
+            oldTree.OpenComponent<FakeComponent>(0);
+            oldTree.SetKey("will delete");
+            oldTree.AddAttribute(1, nameof(FakeComponent.StringProperty), "Anything");
+            oldTree.CloseComponent();
+
+            oldTree.OpenComponent<FakeComponent>(0);
+            oldTree.SetKey("will retain");
+            oldTree.AddAttribute(1, nameof(FakeComponent.StringProperty), "Retained param value");
+            oldTree.CloseComponent();
+
+            // Instantiate initial components
+            GetRenderedBatch(new RenderTreeBuilder(renderer), oldTree, false);
+            var oldComponents = GetComponents(oldTree);
+
+            newTree.OpenComponent<FakeComponent>(0);
+            newTree.SetKey("will retain");
+            newTree.AddAttribute(1, nameof(FakeComponent.StringProperty), "Retained param value");
+            newTree.CloseComponent();
+
+            // Without the key, it updates the param on the first component, then
+            // deletes the second.
+            // With the key, it just deletes the first.
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+            var newComponent = GetComponents(newTree).Single();
+
+            // Assert
+            Assert.Same(oldComponents[1], newComponent);
+            Assert.Collection(result.Edits,
+                entry => AssertEdit(entry, RenderTreeEditType.RemoveFrame, 0));
+        }
+
+        [Fact]
+        public void RecognizesSimultaneousKeyedComponentInsertionsAndDeletions()
+        {
+            // Arrange
+            oldTree.OpenComponent<FakeComponent>(0);
+            oldTree.SetKey("original key");
+            oldTree.CloseComponent();
+
+            // Instantiate initial component
+            GetRenderedBatch(new RenderTreeBuilder(renderer), oldTree, false);
+            var oldComponent = GetComponents(oldTree).Single();
+            Assert.NotNull(oldComponent);
+
+            newTree.OpenComponent<FakeComponent>(0);
+            newTree.SetKey("new key");
+            newTree.CloseComponent();
+
+            // Without the key, it would retain the component
+            // With the key, it deletes the old component and inserts the new component
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+            var newComponent = GetComponents(newTree).Single();
+
+            // Assert
+            Assert.NotNull(newComponent);
+            Assert.NotSame(oldComponent, newComponent);
+            Assert.Collection(result.Edits,
+                entry =>
+                {
+                    AssertEdit(entry, RenderTreeEditType.PrependFrame, 0);
+                    Assert.Equal(0, entry.ReferenceFrameIndex);
+                    Assert.Equal("new key", referenceFrames[entry.ReferenceFrameIndex].ComponentKey);
+                },
+                entry => AssertEdit(entry, RenderTreeEditType.RemoveFrame, 1));
+        }
+
+        [Fact]
+        public void HandlesClashingKeys_FirstUsage()
+        {
+            // This scenario is problematic for the algorithm if it uses a "first key
+            // usage wins" policy for duplicate keys. It would not end up with attrib1b
+            // anywhere in the output, because whenever it sees key1 in oldTree, it tries
+            // to diff against the first usage of key1 in newTree, which has attrib1a.
+
+            // However, because of the actual "duplicated keys are excluded from the
+            // dictionary match" policy, we don't preserve any of the key1 items, and
+            // the diff is valid.
+
+            // Arrange
+            AddWithKey(oldTree, "key3", "attrib3");
+            AddWithKey(oldTree, "key1", "attrib1a");
+            AddWithKey(oldTree, "key1", "attrib1a");
+            AddWithKey(oldTree, "key2", "attrib2");
+
+            AddWithKey(newTree, "key1", "attrib1a");
+            AddWithKey(newTree, "key2", "attrib2");
+            AddWithKey(newTree, "key1", "attrib1b");
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                // Insert key1+attrib1a at the top
+                edit =>
+                {
+                    AssertEdit(edit, RenderTreeEditType.PrependFrame, 0);
+                    Assert.Equal("attrib1a", referenceFrames[edit.ReferenceFrameIndex + 1].AttributeValue);
+                },
+                // Delete key3+attrib3
+                edit => AssertEdit(edit, RenderTreeEditType.RemoveFrame, 1),
+                // Delete key1+attrib1a
+                edit => AssertEdit(edit, RenderTreeEditType.RemoveFrame, 1),
+                // Delete the other key1+attrib1a
+                edit => AssertEdit(edit, RenderTreeEditType.RemoveFrame, 1),
+                // Insert key1+attrib1b at the bottom
+                edit =>
+                {
+                    AssertEdit(edit, RenderTreeEditType.PrependFrame, 2);
+                    Assert.Equal("attrib1b", referenceFrames[edit.ReferenceFrameIndex + 1].AttributeValue);
+                });
+        }
+
+        [Fact]
+        public void HandlesClashingKeys_LastUsage()
+        {
+            // This scenario is problematic for the algorithm if it uses a "last key
+            // usage wins" policy for duplicate keys. It would not end up with attrib1b
+            // anywhere in the output, because when it sees key1 in oldTree, it tries
+            // to diff against the last usage of key1 in newTree, which has attrib1a.
+
+            // However, because of the actual "duplicated keys are excluded from the
+            // dictionary match" policy, we don't preserve any of the key1 items, and
+            // the diff is valid.
+
+            // Arrange
+            AddWithKey(oldTree, "key1", "attrib1a");
+            AddWithKey(oldTree, "key2", "attrib2");
+            AddWithKey(oldTree, "key1", "attrib1b");
+
+            AddWithKey(newTree, "key2", "attrib2");
+            AddWithKey(newTree, "key1", "attrib1b");
+            AddWithKey(newTree, "key1", "attrib1a");
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                // Delete key1+attrib1a
+                edit => AssertEdit(edit, RenderTreeEditType.RemoveFrame, 0),
+                // Insert a new key1+attrib1a at the bottom
+                edit =>
+                {
+                    AssertEdit(edit, RenderTreeEditType.PrependFrame, 2);
+                    Assert.Equal("attrib1a", referenceFrames[edit.ReferenceFrameIndex + 1].AttributeValue);
+                });
+        }
+
+        [Fact]
+        public void HandlesInsertionOfUnkeyedItemsAroundKey()
+        {
+            // The fact that the new sequence numbers are descending makes this
+            // problematic if it prefers matching by sequence over key.
+            // However, since the policy is to prefer key over sequence, it works OK.
+
+            // Arrange
+            oldTree.OpenElement(1, "el");
+            oldTree.SetKey("some key");
+            oldTree.CloseElement();
+
+            newTree.OpenElement(2, "other");
+            newTree.CloseElement();
+
+            newTree.OpenElement(1, "el");
+            newTree.SetKey("some key");
+            newTree.CloseElement();
+
+            newTree.OpenElement(0, "other 2");
+            newTree.CloseElement();
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                edit => AssertEdit(edit, RenderTreeEditType.PrependFrame, 0),
+                edit => AssertEdit(edit, RenderTreeEditType.PrependFrame, 2));
+        }
+
+        [Fact]
+        public void HandlesDeletionOfUnkeyedItemsAroundKey()
+        {
+            // The fact that the old sequence numbers are descending makes this
+            // problematic if it prefers matching by sequence over key.
+            // However, since the policy is to prefer key over sequence, it works OK.
+
+            // Arrange
+            oldTree.OpenElement(2, "other");
+            oldTree.CloseElement();
+
+            oldTree.OpenElement(1, "el");
+            oldTree.SetKey("some key");
+            oldTree.CloseElement();
+
+            oldTree.OpenElement(0, "other 2");
+            oldTree.CloseElement();
+
+            newTree.OpenElement(1, "el");
+            newTree.SetKey("some key");
+            newTree.CloseElement();
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                edit => AssertEdit(edit, RenderTreeEditType.RemoveFrame, 0),
+                edit => AssertEdit(edit, RenderTreeEditType.RemoveFrame, 1));
+        }
+
+        [Fact]
+        public void HandlesKeyBeingAdded()
+        {
+            // This is an anomolous situation that can't occur with .razor components.
+            // It represents the case where, for the same sequence number, we have an
+            // old frame without a key and a new frame with a key.
+
+            // Arrange
+            oldTree.OpenElement(0, "el");
+            oldTree.CloseElement();
+
+            newTree.OpenElement(0, "el");
+            newTree.SetKey("some key");
+            newTree.CloseElement();
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                // Insert new
+                edit =>
+                {
+                    AssertEdit(edit, RenderTreeEditType.PrependFrame, 0);
+                    Assert.Equal("some key", referenceFrames[edit.ReferenceFrameIndex].ElementKey);
+                },
+                // Delete old
+                edit => AssertEdit(edit, RenderTreeEditType.RemoveFrame, 1));
+        }
+
+        [Fact]
+        public void HandlesKeyBeingRemoved()
+        {
+            // This is an anomolous situation that can't occur with .razor components.
+            // It represents the case where, for the same sequence number, we have an
+            // old frame with a key and a new frame without a key.
+
+            // Arrange
+            oldTree.OpenElement(0, "el");
+            oldTree.SetKey("some key");
+            oldTree.CloseElement();
+
+            newTree.OpenElement(0, "el");
+            newTree.CloseElement();
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                // Insert new
+                edit => AssertEdit(edit, RenderTreeEditType.PrependFrame, 0),
+                // Delete old
+                edit => AssertEdit(edit, RenderTreeEditType.RemoveFrame, 1));
+        }
+
         [Fact]
         public void RecognizesTrailingSequenceWithinLoopBlockBeingRemoved()
         {
@@ -1492,6 +1903,254 @@ public void DoesNotInvokeAssignerAgainForRetainedComponents()
             Assert.Empty(referenceFrames);
         }
 
+        [Fact]
+        public void RecognizesKeyedElementMoves()
+        {
+            // Arrange
+            oldTree.OpenElement(0, "container");
+            oldTree.SetKey("first key");
+            oldTree.AddContent(1, "First");
+            oldTree.CloseElement();
+
+            oldTree.AddContent(2, "Unkeyed item");
+
+            oldTree.OpenElement(0, "container");
+            oldTree.SetKey("second key");
+            oldTree.AddContent(1, "Second");
+            oldTree.CloseElement();
+
+            newTree.OpenElement(0, "container");
+            newTree.SetKey("second key");
+            newTree.AddContent(1, "Second");
+            newTree.CloseElement();
+
+            newTree.AddContent(2, "Unkeyed item");
+
+            newTree.OpenElement(0, "container");
+            newTree.SetKey("first key");
+            newTree.AddContent(1, "First modified");
+            newTree.CloseElement();
+
+            // Without the key, it changes the text contents of both
+            // With the key, it reorders them and just updates the text content of one
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                // First we update the modified descendants in place
+                entry => AssertEdit(entry, RenderTreeEditType.StepIn, 0),
+                entry =>
+                {
+                    AssertEdit(entry, RenderTreeEditType.UpdateText, 0);
+                    Assert.Equal(0, entry.ReferenceFrameIndex);
+                    Assert.Equal("First modified", referenceFrames[entry.ReferenceFrameIndex].TextContent);
+                },
+                entry => AssertEdit(entry, RenderTreeEditType.StepOut, 0),
+
+                // Then we have the permutation list
+                entry => AssertPermutationListEntry(entry, 0, 2),
+                entry => AssertPermutationListEntry(entry, 2, 0),
+                entry => AssertEdit(entry, RenderTreeEditType.PermutationListEnd, 0));
+        }
+
+        [Fact]
+        public void RecognizesKeyedComponentMoves()
+        {
+            // Arrange
+            oldTree.OpenComponent<CaptureSetParametersComponent>(0);
+            oldTree.SetKey("first key");
+            oldTree.AddAttribute(1, nameof(FakeComponent.StringProperty), "First param");
+            oldTree.CloseComponent();
+
+            oldTree.AddContent(2, "Unkeyed item");
+
+            oldTree.OpenComponent<CaptureSetParametersComponent>(0);
+            oldTree.SetKey("second key");
+            oldTree.AddAttribute(1, nameof(FakeComponent.StringProperty), "Second param");
+            oldTree.CloseComponent();
+
+            GetRenderedBatch(new RenderTreeBuilder(renderer), oldTree, false); // Assign initial IDs
+            var oldComponents = GetComponents<CaptureSetParametersComponent>(oldTree);
+
+            newTree.OpenComponent<CaptureSetParametersComponent>(0);
+            newTree.SetKey("second key");
+            newTree.AddAttribute(1, nameof(FakeComponent.StringProperty), "Second param");
+            newTree.CloseComponent();
+
+            newTree.AddContent(2, "Unkeyed item");
+
+            newTree.OpenComponent<CaptureSetParametersComponent>(0);
+            newTree.SetKey("first key");
+            newTree.AddAttribute(1, nameof(FakeComponent.StringProperty), "First param modified");
+            newTree.CloseComponent();
+
+            // Without the key, it changes the parameter on both
+            // With the key, it reorders them and just updates the parameter of one
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+            var newComponents = GetComponents<CaptureSetParametersComponent>(newTree);
+
+            // Assert: Retains component instances
+            Assert.Same(oldComponents[0], newComponents[1]);
+            Assert.Same(oldComponents[1], newComponents[0]);
+
+            // Assert: Supplies updated params only to (originally) first component
+            Assert.Equal(2, oldComponents[0].SetParametersCallCount);
+            Assert.Equal(1, oldComponents[1].SetParametersCallCount);
+
+            // Assert: Correct diff
+            Assert.Collection(result.Edits,
+                entry => AssertPermutationListEntry(entry, 0, 2),
+                entry => AssertPermutationListEntry(entry, 2, 0),
+                entry => AssertEdit(entry, RenderTreeEditType.PermutationListEnd, 0));
+        }
+
+        [Fact]
+        public void CanMoveBeforeInsertedItem()
+        {
+            // Arrange
+            AddWithKey(oldTree, "will retain");
+            AddWithKey(oldTree, "will move");
+
+            AddWithKey(newTree, "will move");
+            AddWithKey(newTree, "newly inserted");
+            AddWithKey(newTree, "will retain");
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                entry => {
+                    AssertEdit(entry, RenderTreeEditType.PrependFrame, 1);
+                    Assert.Equal(0, entry.ReferenceFrameIndex);
+                    Assert.Equal("newly inserted", referenceFrames[entry.ReferenceFrameIndex].ElementKey);
+                },
+                entry => AssertPermutationListEntry(entry, 0, 2),
+                entry => AssertPermutationListEntry(entry, 2, 0),
+                entry => AssertEdit(entry, RenderTreeEditType.PermutationListEnd, 0));
+        }
+
+        [Fact]
+        public void CanMoveBeforeDeletedItem()
+        {
+            // Arrange
+            AddWithKey(oldTree, "will retain");
+            AddWithKey(oldTree, "will delete");
+            AddWithKey(oldTree, "will move");
+
+            AddWithKey(newTree, "will move");
+            AddWithKey(newTree, "will retain");
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                entry => AssertEdit(entry, RenderTreeEditType.RemoveFrame, 1),
+                entry => AssertPermutationListEntry(entry, 0, 1),
+                entry => AssertPermutationListEntry(entry, 1, 0),
+                entry => AssertEdit(entry, RenderTreeEditType.PermutationListEnd, 0));
+        }
+
+        [Fact]
+        public void CanMoveAfterInsertedItem()
+        {
+            // Arrange
+            AddWithKey(oldTree, "will move");
+            AddWithKey(oldTree, "will retain");
+
+            AddWithKey(newTree, "newly inserted");
+            AddWithKey(newTree, "will retain");
+            AddWithKey(newTree, "will move");
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                entry => {
+                    AssertEdit(entry, RenderTreeEditType.PrependFrame, 0);
+                    Assert.Equal(0, entry.ReferenceFrameIndex);
+                    Assert.Equal("newly inserted", referenceFrames[entry.ReferenceFrameIndex].ElementKey);
+                },
+                entry => AssertPermutationListEntry(entry, 1, 2),
+                entry => AssertPermutationListEntry(entry, 2, 1),
+                entry => AssertEdit(entry, RenderTreeEditType.PermutationListEnd, 0));
+        }
+
+        [Fact]
+        public void CanMoveAfterDeletedItem()
+        {
+            // Arrange
+            AddWithKey(oldTree, "will move");
+            AddWithKey(oldTree, "will delete");
+            AddWithKey(oldTree, "will retain");
+
+            AddWithKey(newTree, "will retain");
+            AddWithKey(newTree, "will move");
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                entry => AssertEdit(entry, RenderTreeEditType.RemoveFrame, 1),
+                entry => AssertPermutationListEntry(entry, 0, 1),
+                entry => AssertPermutationListEntry(entry, 1, 0),
+                entry => AssertEdit(entry, RenderTreeEditType.PermutationListEnd, 0));
+        }
+
+        [Fact]
+        public void CanChangeFrameTypeWithMatchingSequenceNumber()
+        {
+            oldTree.OpenElement(0, "some elem");
+            oldTree.AddContent(1, "Hello!");
+            oldTree.CloseElement();
+
+            newTree.AddContent(0, "some text");
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                entry =>
+                {
+                    AssertEdit(entry, RenderTreeEditType.PrependFrame, 0);
+                    Assert.Equal(0, entry.ReferenceFrameIndex);
+                    Assert.Equal("some text", referenceFrames[entry.ReferenceFrameIndex].TextContent);
+                },
+                entry => AssertEdit(entry, RenderTreeEditType.RemoveFrame, 1));
+        }
+
+        [Fact]
+        public void CanChangeFrameTypeWithMatchingKey()
+        {
+            oldTree.OpenComponent<FakeComponent>(0);
+            oldTree.CloseComponent();
+
+            newTree.OpenElement(0, "some elem");
+            newTree.SetKey("my key");
+            newTree.CloseElement();
+
+            // Act
+            var (result, referenceFrames) = GetSingleUpdatedComponent();
+
+            // Assert
+            Assert.Collection(result.Edits,
+                entry =>
+                {
+                    AssertEdit(entry, RenderTreeEditType.PrependFrame, 0);
+                    Assert.Equal(0, entry.ReferenceFrameIndex);
+                    Assert.Equal("some elem", referenceFrames[entry.ReferenceFrameIndex].ElementName);
+                },
+                entry => AssertEdit(entry, RenderTreeEditType.RemoveFrame, 1));
+        }
+
         private (RenderTreeDiff, RenderTreeFrame[]) GetSingleUpdatedComponent(bool initializeFromFrames = false)
         {
             var result = GetSingleUpdatedComponentWithBatch(initializeFromFrames);
@@ -1524,6 +2183,28 @@ private RenderBatch GetRenderedBatch(RenderTreeBuilder from, RenderTreeBuilder t
             return batchBuilder.ToBatch();
         }
 
+        private static IList<IComponent> GetComponents(RenderTreeBuilder builder)
+            => GetComponents<IComponent>(builder);
+
+        private static IList<T> GetComponents<T>(RenderTreeBuilder builder) where T : IComponent
+            => builder.GetFrames().AsEnumerable()
+                .Where(x => x.FrameType == RenderTreeFrameType.Component)
+                .Select(x => (T)x.Component)
+                .ToList();
+
+        private static void AddWithKey(RenderTreeBuilder builder, object key, string attributeValue = null)
+        {
+            builder.OpenElement(0, "el");
+            builder.SetKey(key);
+
+            if (attributeValue != null)
+            {
+                builder.AddAttribute(1, "attrib", attributeValue);
+            }
+
+            builder.CloseElement();
+        }
+
         private class FakeRenderer : Renderer
         {
             public FakeRenderer() : base(new TestServiceProvider(), new RendererSynchronizationContext())
@@ -1613,5 +2294,15 @@ private static void AssertEdit(
             Assert.Equal(type, edit.Type);
             Assert.Equal(siblingIndex, edit.SiblingIndex);
         }
+
+        private static void AssertPermutationListEntry(
+            RenderTreeEdit edit,
+            int fromSiblingIndex,
+            int toSiblingIndex)
+        {
+            Assert.Equal(RenderTreeEditType.PermutationListEntry, edit.Type);
+            Assert.Equal(fromSiblingIndex, edit.SiblingIndex);
+            Assert.Equal(toSiblingIndex, edit.MoveToSiblingIndex);
+        }
     }
 }
diff --git a/src/Components/Components/test/StackObjectPoolTest.cs b/src/Components/Components/test/StackObjectPoolTest.cs
new file mode 100644
index 000000000000..33b9becc0549
--- /dev/null
+++ b/src/Components/Components/test/StackObjectPoolTest.cs
@@ -0,0 +1,123 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Linq;
+using Xunit;
+
+namespace Microsoft.AspNetCore.Components.RenderTree
+{
+    public class StackObjectPoolTest
+    {
+        [Fact]
+        public void CanGetInstances()
+        {
+            // Arrange
+            var stackObjectPool = new StackObjectPool<object>(10, () => new object());
+
+            // Act
+            var instance1 = stackObjectPool.Get();
+            var instance2 = stackObjectPool.Get();
+
+            // Assert
+            Assert.NotNull(instance1);
+            Assert.NotNull(instance2);
+            Assert.NotSame(instance1, instance2);
+        }
+
+        [Fact]
+        public void CanReturnInstances()
+        {
+            // Arrange
+            var stackObjectPool = new StackObjectPool<object>(10, () => new object());
+            var instance1 = stackObjectPool.Get();
+            var instance2 = stackObjectPool.Get();
+
+            // Act/Assert
+            // No exception means success
+            stackObjectPool.Return(instance2);
+            stackObjectPool.Return(instance1);
+        }
+
+        [Fact]
+        public void ReusesInstancesInPoolUpToCapacity()
+        {
+            // Arrange
+            var stackObjectPool = new StackObjectPool<object>(10, () => new object());
+            var instance1 = stackObjectPool.Get();
+            var instance2 = stackObjectPool.Get();
+            stackObjectPool.Return(instance2);
+            stackObjectPool.Return(instance1);
+
+            // Act
+            var instance1b = stackObjectPool.Get();
+            var instance2b = stackObjectPool.Get();
+            var instance3 = stackObjectPool.Get();
+
+            // Assert
+            Assert.Same(instance1, instance1b);
+            Assert.Same(instance2, instance2b);
+            Assert.NotNull(instance3);
+            Assert.NotSame(instance1, instance3);
+            Assert.NotSame(instance2, instance3);
+        }
+
+        [Fact]
+        public void SuppliesTransientInstancesWhenExceedingCapacity()
+        {
+            // Arrange
+            var stackObjectPool = new StackObjectPool<object>(1, () => new object());
+
+            // Act 1: Returns distinct instances beyond capacity
+            var instance1 = stackObjectPool.Get();
+            var instance2 = stackObjectPool.Get();
+            var instance3 = stackObjectPool.Get();
+            Assert.NotNull(instance1);
+            Assert.NotNull(instance2);
+            Assert.NotNull(instance3);
+            Assert.Equal(3, new[] { instance1, instance2, instance3 }.Distinct().Count());
+
+            // Act 2: Can return all instances, including transient ones
+            stackObjectPool.Return(instance3);
+            stackObjectPool.Return(instance2);
+            stackObjectPool.Return(instance1);
+
+            // Act 3: Reuses only the non-transient instances
+            var instance1b = stackObjectPool.Get();
+            var instance2b = stackObjectPool.Get();
+            Assert.Same(instance1, instance1b);
+            Assert.NotSame(instance2b, instance2);
+            Assert.Equal(4, new[] { instance1, instance2, instance3, instance2b }.Distinct().Count());
+        }
+
+        [Fact]
+        public void CannotReturnWhenEmpty()
+        {
+            // Arrange
+            var stackObjectPool = new StackObjectPool<object>(10, () => new object());
+
+            // Act/Assert
+            var ex = Assert.Throws<InvalidOperationException>(() =>
+            {
+                stackObjectPool.Return(new object());
+            });
+            Assert.Equal("There are no outstanding instances to return.", ex.Message);
+        }
+
+        [Fact]
+        public void CannotReturnMismatchingTrackedItem()
+        {
+            // Arrange
+            var stackObjectPool = new StackObjectPool<object>(10, () => new object());
+            var instance1 = stackObjectPool.Get();
+            var instance2 = stackObjectPool.Get();
+
+            // Act/Assert
+            var ex = Assert.Throws<ArgumentException>(() =>
+            {
+                stackObjectPool.Return(instance1);
+            });
+            Assert.Equal("Attempting to return wrong pooled instance. Get/Return calls must form a stack.", ex.Message);
+        }
+    }
+}
diff --git a/src/Components/Server/src/Circuits/RenderBatchWriter.cs b/src/Components/Server/src/Circuits/RenderBatchWriter.cs
index 321bef10845f..d66c5de2a5dc 100644
--- a/src/Components/Server/src/Circuits/RenderBatchWriter.cs
+++ b/src/Components/Server/src/Circuits/RenderBatchWriter.cs
@@ -105,7 +105,11 @@ void Write(in RenderTreeEdit edit)
             // for this specific RenderTreeEditType.
             _binaryWriter.Write((int)edit.Type);
             _binaryWriter.Write(edit.SiblingIndex);
+
+            // ReferenceFrameIndex and MoveToSiblingIndex share a slot, so this writes
+            // whichever one applies to the edit type
             _binaryWriter.Write(edit.ReferenceFrameIndex);
+
             WriteString(edit.RemovedAttributeName, allowDeduplication: true);
         }
 
diff --git a/src/Components/test/E2ETest/Tests/KeyTest.cs b/src/Components/test/E2ETest/Tests/KeyTest.cs
new file mode 100644
index 000000000000..32f3ad5e3f69
--- /dev/null
+++ b/src/Components/test/E2ETest/Tests/KeyTest.cs
@@ -0,0 +1,351 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using BasicTestApp;
+using Microsoft.AspNetCore.Components.E2ETest.Infrastructure;
+using Microsoft.AspNetCore.Components.E2ETest.Infrastructure.ServerFixtures;
+using Microsoft.AspNetCore.E2ETesting;
+using Microsoft.JSInterop;
+using OpenQA.Selenium;
+using OpenQA.Selenium.Interactions;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace Microsoft.AspNetCore.Components.E2ETest.Tests
+{
+    public class KeyTest : BasicTestAppTestBase
+    {
+        public KeyTest(
+            BrowserFixture browserFixture,
+            ToggleExecutionModeServerFixture<Program> serverFixture,
+            ITestOutputHelper output)
+            : base(browserFixture, serverFixture, output)
+        {
+        }
+
+        protected override void InitializeAsyncCore()
+        {
+            // On WebAssembly, page reloads are expensive so skip if possible
+            Navigate(ServerPathBase, noReload: !_serverFixture.UsingAspNetHost);
+        }
+
+        [Fact]
+        public void CanInsert()
+        {
+            PerformTest(
+                before: new[]
+                {
+                    new Node("orig1", "A"),
+                    new Node("orig2", "B"),
+                },
+                after: new[]
+                {
+                    new Node("new1", "Inserted before") { IsNew = true },
+                    new Node("orig1", "A"),
+                    new Node("new2", "Inserted between") { IsNew = true },
+                    new Node("orig2", "B edited"),
+                    new Node("new3", "Inserted after") { IsNew = true },
+                });
+        }
+
+        [Fact]
+        public void CanDelete()
+        {
+            PerformTest(
+                before: new[]
+                {
+                    new Node("orig1", "A"), // Will delete first
+                    new Node("orig2", "B"),
+                    new Node("orig3", "C"), // Will delete in middle
+                    new Node("orig4", "D"),
+                    new Node("orig5", "E"), // Will delete at end
+                },
+                after: new[]
+                {
+                    new Node("orig2", "B"),
+                    new Node("orig4", "D edited"),
+                });
+        }
+
+        [Fact]
+        public void CanInsertUnkeyed()
+        {
+            PerformTest(
+               before: new[]
+               {
+                    new Node("orig1", "A"),
+                    new Node("orig2", "B"),
+               },
+               after: new[]
+               {
+                   new Node(null, "Inserted before") { IsNew = true },
+                   new Node("orig1", "A edited"),
+                   new Node(null, "Inserted between") { IsNew = true },
+                   new Node("orig2", "B"),
+                   new Node(null, "Inserted after") { IsNew = true },
+               });
+        }
+
+        [Fact]
+        public void CanDeleteUnkeyed()
+        {
+            PerformTest(
+                before: new[]
+                {
+                    new Node(null, "A"), // Will delete first
+                    new Node("orig2", "B"),
+                    new Node(null, "C"), // Will delete in middle
+                    new Node("orig4", "D"),
+                    new Node(null, "E"), // Will delete at end
+                },
+                after: new[]
+                {
+                    new Node("orig2", "B edited"),
+                    new Node("orig4", "D"),
+                });
+        }
+
+        [Fact]
+        public void CanReorder()
+        {
+            PerformTest(
+                before: new[]
+                {
+                    new Node("keyA", "A",
+                        new Node("keyA1", "A1"),
+                        new Node("keyA2", "A2"),
+                        new Node("keyA3", "A3")),
+                    new Node("keyB", "B",
+                        new Node("keyB1", "B1"),
+                        new Node("keyB2", "B2"),
+                        new Node("keyB3", "B3")),
+                    new Node("keyC", "C",
+                        new Node("keyC1", "C1"),
+                        new Node("keyC2", "C2"),
+                        new Node("keyC3", "C3")),
+                },
+                after: new[]
+                {
+                    // We're implicitly verifying that all the component instances were preserved,
+                    // because we're not marking any with "IsNew = true"
+                    new Node("keyC", "C", // Rotate all three (ABC->CAB)
+                        // Swap first and last
+                        new Node("keyC3", "C3"),
+                        new Node("keyC2", "C2 edited"),
+                        new Node("keyC1", "C1")),
+                    new Node("keyA", "A",
+                        // Swap first two
+                        new Node("keyA2", "A2 edited"),
+                        new Node("keyA1", "A1"),
+                        new Node("keyA3", "A3")),
+                    new Node("keyB", "B edited",
+                        // Swap last two
+                        new Node("keyB1", "B1"),
+                        new Node("keyB3", "B3"),
+                        new Node("keyB2", "B2 edited")),
+                });
+        }
+
+        [Fact]
+        public void CanReorderInsertDeleteAndEdit_WithAndWithoutKeys()
+        {
+            // This test is a complex bundle of many types of changes happening simultaneously
+            PerformTest(
+                before: new[]
+                {
+                    new Node("keyA", "A",
+                        new Node("keyA1", "A1"),
+                        new Node(null, "A2 unkeyed"),
+                        new Node("keyA3", "A3"),
+                        new Node("keyA4", "A4")),
+                    new Node("keyB", "B",
+                        new Node(null, "B1 unkeyed"),
+                        new Node("keyB2", "B2"),
+                        new Node("keyB3", "B3"),
+                        new Node("keyB4", "B4")),
+                    new Node("keyC", "C",
+                        new Node("keyC1", "C1"),
+                        new Node("keyC2", "C2"),
+                        new Node("keyC3", "C3"),
+                        new Node(null, "C4 unkeyed")),
+                },
+                after: new[]
+                {
+                    // Swapped A and C
+                    new Node("keyC", "C",
+                        // C1-4 were reordered
+                        // C5 was inserted
+                        new Node("keyC5", "C5 inserted") { IsNew = true },
+                        new Node("keyC2", "C2"),
+                        // C6 was inserted with no key
+                        new Node(null, "C6 unkeyed inserted") { IsNew = true },
+                        // C1 was edited
+                        new Node("keyC1", "C1 edited"),
+                        new Node("keyC3", "C3")
+                        // C4 unkeyed was deleted
+                        ),
+                    // B was deleted
+                    // D was inserted
+                    new Node("keyD", "D inserted",
+                        new Node("keyB1", "D1") { IsNew = true }, // Matches an old key, but treated as new because we don't move between parents
+                        new Node("keyD2", "D2") { IsNew = true },
+                        new Node(null, "D3 unkeyed") { IsNew = true })
+                        { IsNew = true },
+                    new Node("keyA", "A",
+                        new Node("keyA1", "A1"),
+                        // A2 (unkeyed) was edited
+                        new Node(null, "A2 unkeyed edited"),
+                        new Node("keyA3", "A3"),
+                        // A4 was deleted
+                        // A5 was inserted
+                        new Node("keyA5", "A5 inserted") { IsNew = true }),
+                });
+        }
+
+        [Fact]
+        public async Task CanRetainFocusWhileMovingTextBox()
+        {
+            var appElem = MountTestComponent<ReorderingFocusComponent>();
+            Func<IWebElement> textboxFinder = () => appElem.FindElement(By.CssSelector(".incomplete-items .item-1 input[type=text]"));
+            var textToType = "Hello this is a long string that should be typed";
+            var expectedTextTyped = "";
+
+            textboxFinder().Clear();
+
+            // On each keystroke, the boxes will be shuffled. The text will only
+            // be inserted correctly if focus is retained. 
+            textboxFinder().Click();
+            while (textToType.Length > 0)
+            {
+                var nextBlockLength = Math.Min(5, textToType.Length);
+                var nextBlock = textToType.Substring(0, nextBlockLength);
+                textToType = textToType.Substring(nextBlockLength);
+                expectedTextTyped += nextBlock;
+
+                // Send keys to whatever has focus
+                new Actions(Browser).SendKeys(nextBlock).Perform();
+                Browser.Equal(expectedTextTyped, () => textboxFinder().GetAttribute("value"));
+
+                // We delay between typings to ensure the events aren't all collapsed into one.
+                await Task.Delay(100);
+            }
+
+            // Verify that after all this, we can still move the edited item
+            // This was broken originally because of unexpected event-handling behavior
+            // in Chrome (it raised events recursively)
+            appElem.FindElement(
+                By.CssSelector(".incomplete-items .item-1 input[type=checkbox]")).Click();
+            Browser.Equal(expectedTextTyped, () => appElem
+                .FindElement(By.CssSelector(".complete-items .item-1 input[type=text]"))
+                .GetAttribute("value"));
+        }
+
+        [Fact]
+        public void CanUpdateCheckboxStateWhileMovingIt()
+        {
+            var appElem = MountTestComponent<ReorderingFocusComponent>();
+            Func<IWebElement> checkboxFinder = () => appElem.FindElement(By.CssSelector(".item-2 input[type=checkbox]"));
+            Func<IEnumerable<bool>> incompleteItemStates = () => appElem
+                .FindElements(By.CssSelector(".incomplete-items input[type=checkbox]"))
+                .Select(elem => elem.Selected);
+            Func<IEnumerable<bool>> completeItemStates = () => appElem
+                .FindElements(By.CssSelector(".complete-items input[type=checkbox]"))
+                .Select(elem => elem.Selected);
+
+            // Verify initial state
+            Browser.Equal(new[] { false, false, false, false, false }, incompleteItemStates);
+            Browser.Equal(Array.Empty<bool>(), completeItemStates);
+
+            // Check a box; see it moves and becomes the sole checked item
+            checkboxFinder().Click();
+            Browser.True(() => checkboxFinder().Selected);
+            Browser.Equal(new[] { false, false, false, false }, incompleteItemStates);
+            Browser.Equal(new[] { true }, completeItemStates);
+
+            // Also uncheck it; see it moves and becomes unchecked
+            checkboxFinder().Click();
+            Browser.False(() => checkboxFinder().Selected);
+            Browser.Equal(new[] { false, false, false, false, false }, incompleteItemStates);
+            Browser.Equal(Array.Empty<bool>(), completeItemStates);
+        }
+
+        private void PerformTest(Node[] before, Node[] after)
+        {
+            var rootBefore = new Node(null, "root", before);
+            var rootAfter = new Node(null, "root", after);
+            var jsonBefore = Json.Serialize(rootBefore);
+            var jsonAfter = Json.Serialize(rootAfter);
+
+            var appElem = MountTestComponent<KeyCasesComponent>();
+            var textbox = appElem.FindElement(By.TagName("textarea"));
+            var updateButton = appElem.FindElement(By.TagName("button"));
+
+            SetTextAreaValueFast(textbox, jsonBefore);
+            updateButton.Click();
+            ValidateRenderedOutput(appElem, rootBefore, validatePreservation: false);
+
+            SetTextAreaValueFast(textbox, jsonAfter);
+            updateButton.Click();
+            ValidateRenderedOutput(appElem, rootAfter, validatePreservation: true);
+        }
+
+        private static void ValidateRenderedOutput(IWebElement appElem, Node expectedRootNode, bool validatePreservation)
+        {
+            var actualRootElem = appElem.FindElement(By.CssSelector(".render-output > .node"));
+            var actualRootNode = ReadNodeFromDOM(actualRootElem);
+            AssertNodesEqual(expectedRootNode, actualRootNode, validatePreservation);
+        }
+
+        private static void AssertNodesEqual(Node expectedRootNode, Node actualRootNode, bool validatePreservation)
+        {
+            Assert.Equal(expectedRootNode.Label, actualRootNode.Label);
+
+            if (validatePreservation)
+            {
+                Assert.Equal(expectedRootNode.IsNew, actualRootNode.IsNew);
+            }
+
+            Assert.Collection(
+                actualRootNode.Children,
+                expectedRootNode.Children.Select<Node, Action<Node>>(expectedChild =>
+                    (actualChild => AssertNodesEqual(expectedChild, actualChild, validatePreservation))).ToArray());
+        }
+
+        private static Node ReadNodeFromDOM(IWebElement nodeElem)
+        {
+            var label = nodeElem.FindElement(By.ClassName("label")).Text;
+            var childNodes = nodeElem
+                .FindElements(By.XPath("*[@class='children']/*[@class='node']"));
+            return new Node(key: null, label, childNodes.Select(ReadNodeFromDOM).ToArray())
+            {
+                IsNew = nodeElem.FindElement(By.ClassName("is-new")).Text == "true"
+            };
+        }
+
+        private void SetTextAreaValueFast(IWebElement textAreaElementWithId, string value)
+        {
+            var javascript = (IJavaScriptExecutor)Browser;
+            javascript.ExecuteScript($"document.getElementById('{textAreaElementWithId.GetAttribute("id")}').value = {Json.Serialize(value)}");
+            textAreaElementWithId.SendKeys(" "); // So it fires the change event
+        }
+
+        class Node
+        {
+            public string Key { get; }
+            public string Label { get; }
+            public Node[] Children { get; }
+            public bool IsNew { get; set; }
+
+            public Node(string key, string label, params Node[] children)
+            {
+                Key = key;
+                Label = label;
+                Children = children ?? Array.Empty<Node>();
+            }
+        }
+    }
+}
diff --git a/src/Components/test/testassets/BasicTestApp/Index.razor b/src/Components/test/testassets/BasicTestApp/Index.razor
index 76c5881080a4..92f8d65b94d7 100644
--- a/src/Components/test/testassets/BasicTestApp/Index.razor
+++ b/src/Components/test/testassets/BasicTestApp/Index.razor
@@ -50,6 +50,8 @@
         <option value="BasicTestApp.FormsTest.TypicalValidationComponent">Typical validation</option>
         <option value="BasicTestApp.FormsTest.NotifyPropertyChangedValidationComponent">INotifyPropertyChanged validation</option>
         <option value="BasicTestApp.InteropOnInitializationComponent">Interop on initialization</option>
+        <option value="BasicTestApp.KeyCasesComponent">Key cases</option>
+        <option value="BasicTestApp.ReorderingFocusComponent">Reordering focus retention</option>
     </select>
 
   @if (SelectedComponentType != null)
diff --git a/src/Components/test/testassets/BasicTestApp/KeyCasesComponent.razor b/src/Components/test/testassets/BasicTestApp/KeyCasesComponent.razor
new file mode 100644
index 000000000000..9ef1a5bffae5
--- /dev/null
+++ b/src/Components/test/testassets/BasicTestApp/KeyCasesComponent.razor
@@ -0,0 +1,73 @@
+@using Microsoft.JSInterop
+<div class="key-cases">
+    <div class="model">
+        <p>Model</p>
+        <textarea bind="@modelJson" id="key-model"></textarea>
+        <button onclick="@Update">Update</button>
+    </div>
+    <div class="render-output">
+        <p>Output</p>
+        <CascadingValue Value="@renderContext" IsFixed="true">
+            <KeyCasesTreeNode Data="@parsedRootNode" />
+        </CascadingValue>
+    </div>
+</div>
+
+<style type="text/css">
+    .key-cases { display: flex; }
+    .key-cases > * { padding: 1rem; border: 1px solid silver; }
+    .key-cases .model { width: 22rem; display: flex; flex-direction: column; }
+    .key-cases .render-output { flex-grow: 1; }
+    .key-cases textarea { height: 24rem; margin: 1rem 0; }
+    .key-cases .children { margin-left: 0.35rem; border-left: 1px solid silver; margin-bottom: 0.3rem; }
+    .key-cases p { margin-top: 0; }
+    .key-cases .node .node::before { content: '–'; color: silver; float: left; margin-right: 0.3rem; }
+    .key-cases .node .node .children { margin-left: 1.1rem; }
+</style>
+
+@functions {
+    string modelJson = @"{
+  ""label"": ""root"",
+  ""children"": [
+    {
+      ""key"": ""a"",
+      ""label"": ""A"",
+      ""children"": [
+        { ""key"": ""a1"", ""label"": ""A1"" },
+        { ""key"": ""a2"", ""label"": ""A2"" },
+        { ""key"": ""a3"", ""label"": ""A3"" }
+      ]
+    },
+    {
+      ""key"": ""b"",
+      ""label"": ""B"",
+      ""children"": [
+        { ""key"": ""b1"", ""label"": ""B1"" },
+        { ""key"": ""b2"", ""label"": ""B2"" },
+        { ""key"": ""b3"", ""label"": ""B3"" }
+      ]
+    }
+  ]
+}";
+
+    KeyCasesTreeNode.Node parsedRootNode;
+    RenderContext renderContext = new RenderContext();
+
+    protected override void OnInit()
+    {
+        Update();
+    }
+
+    void Update()
+    {
+        renderContext.UpdateCount++;
+        parsedRootNode = Json.Deserialize<KeyCasesTreeNode.Node>(modelJson);
+    }
+
+    public class RenderContext
+    {
+        // This is so the descendants can detect and display whether they are
+        // newly-instantiated on any given render
+        public int UpdateCount { get; set; }
+    }
+}
diff --git a/src/Components/test/testassets/BasicTestApp/KeyCasesTreeNode.razor b/src/Components/test/testassets/BasicTestApp/KeyCasesTreeNode.razor
new file mode 100644
index 000000000000..16ed8de0eb67
--- /dev/null
+++ b/src/Components/test/testassets/BasicTestApp/KeyCasesTreeNode.razor
@@ -0,0 +1,53 @@
+<div class="node">
+    <strong class="label">@Data.Label</strong>
+    &nbsp;&nbsp;[
+    Instance: @instanceId;
+
+    Is new:
+    @if (firstCreatedOnUpdateCount == RenderContext.UpdateCount)
+    {
+        <strong class="is-new">true</strong>
+    }
+    else
+    {
+        <span class="is-new">false</span>
+    }
+    ]
+
+    @if (Data.Children?.Any() ?? false)
+    {
+        <div class="children">@{
+            foreach (var child in Data.Children)
+            {
+                if (child.Key != null)
+                {
+                    <KeyCasesTreeNode key="@child.Key" Data="@child" />
+                }
+                else
+                {
+                    <KeyCasesTreeNode Data="@child" />
+                }
+            }
+        }</div>
+    }
+</div>
+
+@functions {
+    public class Node
+    {
+        public object Key { get; set; }
+        public string Label { get; set; }
+        public List<Node> Children { get; set; }
+    }
+
+    string instanceId = Guid.NewGuid().ToString("D").Substring(0, 6);
+    int firstCreatedOnUpdateCount;
+
+    [Parameter] Node Data { get; set; }
+    [CascadingParameter] KeyCasesComponent.RenderContext RenderContext { get; set; }
+
+    protected override void OnInit()
+    {
+        firstCreatedOnUpdateCount = RenderContext.UpdateCount;
+    }
+}
diff --git a/src/Components/test/testassets/BasicTestApp/ReorderingFocusComponent.razor b/src/Components/test/testassets/BasicTestApp/ReorderingFocusComponent.razor
new file mode 100644
index 000000000000..acede2b46572
--- /dev/null
+++ b/src/Components/test/testassets/BasicTestApp/ReorderingFocusComponent.razor
@@ -0,0 +1,55 @@
+<h3>To do</h3>
+
+<p>
+    This component will randomly reorder the todo items on each keystroke.
+    The point of this is to show that focus is correctly preserved even
+    when items are moved around. Also, by checking the boxes to move items
+    between the two lists, we show that use of <code>key</code> causes the
+    form element state to behave as expected.
+</p>
+
+<ul class="incomplete-items">
+    @foreach (var item in todoItems.Where(item => !item.IsDone))
+    {
+        <li key="@item.Id" class="@($"item-{item.Id}")">
+            <input type="checkbox" bind="@item.IsDone"/>
+            <input type="text" bind="@item.Text" oninput="@Shuffle" />
+        </li>
+    }
+</ul>
+
+<h3>Done</h3>
+
+<ul class="complete-items">
+    @foreach (var item in todoItems.Where(item => item.IsDone))
+    {
+        <li key="@item.Id" class="@($"item-{item.Id}")">
+            <input type="checkbox" bind="@item.IsDone" />
+            <input type="text" bind="@item.Text" oninput="@Shuffle" />
+        </li>
+    }
+</ul>
+
+@functions {
+    Random rng = new Random();
+    TodoItem[] todoItems = new[]
+    {
+        new TodoItem { Id = 1, Text = "First" },
+        new TodoItem { Id = 2, Text = "Second" },
+        new TodoItem { Id = 3, Text = "Third" },
+        new TodoItem { Id = 4, Text = "Fourth" },
+        new TodoItem { Id = 5, Text = "Fifth" },
+    };
+
+    void Shuffle()
+    {
+        todoItems = todoItems.OrderBy(x => rng.Next()).ToArray();
+    }
+
+    class TodoItem
+    {
+        public int Id { get; set; }
+        public string Text { get; set; }
+        public bool IsDone { get; set; }
+    }
+}
diff --git a/src/Components/test/testassets/ComponentsApp.App/ComponentsApp.App.csproj b/src/Components/test/testassets/ComponentsApp.App/ComponentsApp.App.csproj
index 3e79d4f6a18f..aa193e921049 100644
--- a/src/Components/test/testassets/ComponentsApp.App/ComponentsApp.App.csproj
+++ b/src/Components/test/testassets/ComponentsApp.App/ComponentsApp.App.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Razor">
+<Project Sdk="Microsoft.NET.Sdk.Razor">
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
@@ -11,4 +11,3 @@
   </ItemGroup>
 
 </Project>
-