[w3c/uievents] MouseEvent.fromElement/toElement (#84)

Consider either spec'ing or trying to kill `MouseEvent.fromElement` & `MouseEvent.toElement`. Here's the current (in)compatibility situation:

|  Events                                          | Chrome+Safari               | Edge                        | Firefox |
| --- | --- | --- | --- |
| `mouseenter`/<br>`mouseleave`/<br>`mouseover`/<br>`mouseout` | `fromElement` & `toElement` | `fromElement` & `toElement` | Neither |
| `click`                                          | `toElement` only            | Neither                     | Neither |

Docs:
* http://www.quirksmode.org/js/events_mouse.html#relatedtarget
* https://msdn.microsoft.com/en-us/library/ms533773(v=vs.85).aspx
* https://msdn.microsoft.com/en-us/library/ms534684(v=vs.85).aspx

Testcase: http://jsbin.com/vivigi/edit?html,js,output

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