Fix validation errors on cart page.

Author: BezV8

app/code/Magento/Checkout/view/frontend/templates/cart/form.phtml

@@ -26,7 +26,7 @@
                class="cart items data table"
                data-mage-init='{"shoppingCart":{"emptyCartButton": "action.clear",
                "updateCartActionContainer": "#update_cart_action_container"}}'>
-            <caption role="heading" aria-level="2" class="table-caption"><?= /* @escapeNotVerified */ __('Shopping Cart Items') ?></caption>
+            <caption class="table-caption"><?= /* @escapeNotVerified */ __('Shopping Cart Items') ?></caption>
             <thead>
                 <tr>
                     <th class="col item" scope="col"><span><?= /* @escapeNotVerified */ __('Item') ?></span></th>

app/code/Magento/Checkout/view/frontend/templates/cart/item/default.phtml

@@ -111,7 +111,7 @@ $canApplyMsrp = $helper->isShowBeforeOrderConfirm($product) && $helper->isMinima
         </td>
     </tr>
     <tr class="item-actions">
-        <td colspan="100">
+        <td colspan="4">
             <div class="actions-toolbar">
                 <?= /* @escapeNotVerified */ $block->getActions($_item) ?>
             </div>