Summary of the major `4.0.0` changes

Each list is sorted by modules alphabetically, with the exception of Core which always comes first.

Breaking changes

Core: Move the factory to separate exports
- 46f6e3d
- This is about the Node.js behavior for windowless environments where require( "jquery" )( window ) is required
Core: Remove deprecated jQuery APIs
- 58f0c00
- jQuery.isArray, jQuery.parseJSON, jQuery.nodeName, jQuery.isFunction, jQuery.isWindow, jQuery.camelCase, jQuery.type, jQuery.now, jQuery.isNumeric, jQuery.cssProps
- Also:
  - jQuery.trim 0b676ae
  - jQuery.fx.interval 6c2c736
Core: Drop support for IE <11, iOS <11, Firefox <65, Android Browser & PhantomJS
- cf84696
- Also:
  - Core: Drop support for Edge Legacy (i.e. non-Chromium Microsoft Edge)
    - e35fb62
Core: Remove private copies of push, sort & splice from the jQuery prototype
- b59107f
Core: Exclude callbacks & deferred modules in the slim build as well
- fbc44f5
- Also:
  - Build: Reduce the slim build header comment & jQuery.fn.jquery
    - 812b4a1
  - Build: Explicitly exclude the queue module from the slim build
    - a503c69
Core: Drop the root parameter of jQuery.fn.init (undocumented)
- d2436df
Ajax: Drop the json to jsonp auto-promotion logic
- e7b3bc4
Ajax: Avoid CSP errors in the script transport for async requests
- 07a8e4a
- Make more requests use the <script src> part of the script transport
Ajax: Don't auto-execute scripts unless dataType provided
- 025da4d
- PR Ajax: Mitigate possible XSS vulnerability #2588 made jQuery stop auto-execute cross-domain scripts unless dataType: "script" was explicitly provided; this change landed in jQuery 3.0.0. This change extends that logic to same-domain scripts as well.
Attributes: Drop the toggleClass(boolean|undefined) signature
- a442110
CSS: Don't automatically add "px" to properties with a few exceptions
- 00a9c2e
CSS: Remove the opacity CSS hook
- 865469f
- The consequence is .css( "opacity" ) will now return an empty string for detached elements in standard-compliant browsers and "1" in IE & the legacy Edge. That behavior is shared by most other CSS properties which we're not normalizing either.
Data: Separate data & css/effects camelCase implementations
- 8fae212
- The data one no longer special-cases ms-
Data:Event:Manipulation: Prevent collisions with Object.prototype
- 9d76c0b
- Breaks code using hasOwnProperty
Deferred: Drop jQuery.Deferred.getStackHook (renamed since 3.7.0 to jQuery.Deferred.getErrorHook)
- 258ca1e
- Used to pass the original error to jQuery.Deferred.exceptionHook (previously we recommended passing stack but that breaks source maps)
Event: Stop shimming focusin & focusout events
- 8a74137
- Affects event order
Event: Avoid collisions between jQuery.event.special & Object.prototype
- bcaeb00
- Affects code calling hasOwnProperty on jQuery.event.special
Manipulation: Avoid concatenating strings in buildFragment
- 9c98e4e
- Needed for Trusted Types support - the breaking aspect of it is likely minimal
Manipulation: Don't remove CDATA sections from scripts
- 2f8f39e
Selector: Drop support for legacy pseudos
- 8c7da22
- References in Sizzle wiki: https://github.com/jquery/sizzle/wiki#-backwards-compatible-plugins-for-pseudos-with-arguments
Selector: Backport jQuery selection context logic to selector-native
- 2e644e8

Other notable changes

Core: Remove IE-specific support tests, rely on document.documentMode
- 3527a38
Core: Migrate from AMD to ES modules 🎉
- d0ce00c
- Also:
  - Core: Use named exports in src/
    - f75daab
Core: Add exports to package.json, export slim & esm builds
- 8be4c0e
Core:Manipulation: Add basic TrustedHTML support
- de5398a
Ajax: Support binary data (including FormData)
- a7ed9a7
- Possible minor breaking change: prefilters are now applied before data is converted to a string
Deferred: Respect source maps in jQuery.Deferred.exceptionHook
- 0b9c503
- Affects errors in Promise callbacks for which jQuery print errors as they are typically human error rather than an exception to handle in code
Selector: reduce size, simplify setDocument
- 29a9544

Summary of the major 4.0.0 changes

Breaking changes

Other notable changes

Summary of the major `4.0.0` changes

Prepare a 4.0 upgrade guide #5365

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Undocumented but still mention

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