Update web-platform-tests to revision 4d96cccabc2feacd48e1dab9afc22b8af2225572

tests/wpt/web-platform-tests/uievents/hierarchy/README.md

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+Verify the Class Hierarchy
+==========================
+
+Make sure the events inherit from the correct interfaces:
+    e.g., UIEvent > MouseEvent
+
+Requires manual and automated tests
+* manually create event and verify hierarchy
+* WebDriver create the event and verify hierarchy
+
+UIEvent
+ * load, unload, abort, error, select, resize, scroll
+ * Note: some event types may be dropped given that they don't appear to be UIEvents by other specs that define them.
+
+FocusEvent
+ * blur, focus, focusin, focusout
+ * blur and focus are handled in HTML5
+ * but they aren't sure if focusin/out are needed: see bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=25877
+
+MouseEvent
+ * click, dblclick, mousedown, mouseenter, mouseleave, mousemove, mouseout, mouseover, mouseup
+
+WheelEvent
+ * wheel
+
+KeyboardEvent
+ * keydown, keyup
+ * need to show interaction with beforeinput and input, which are in the Editing spec
+
+CompositionEvent
+ * compositionstart
+ * compositionupdate
+ * compositionend
+ * need to show interaction with the keyboard events: keydown, keyup