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