IE 11 used to have an issue where if an element inside an iframe was put
in fullscreen mode, the element dimensions started being 100 times too small;
we've added a workaround that would multiply them by 100. However, the IE 11
issue has been unexpectedly fixed and since our detection was really detecting
the browser and not a bug, we've started breaking the browser instead of fixing
it.

Since there's no good way to detect if the bug exists, we have to back the
workaround out completely.

Refs ff1a082
Fixes gh-3041
Refs gh-1764
Refs gh-2401
Refs 90d828b

Safari 9.1 shares its support test results with Safari 9.0 but it's been
excluded from the regex catching Safari 9.0. This has been fixed.

(cherry-picked from 234a2d8)

The word boundary character will prevent iOS from being a false positive.

(cherry-picked from 7f2ebd2)

Fixes gh-2945

Fixes gh-3094
Close gh-3116

In Firefox, called `stop(Immediate)Propagation` methods,
in capturing phase prevents receiving focus

Cherry-picked from 94efb79
Fixes gh-3111

So it would correspond to one in master

This reverts commit afe2727.

Ref 66b8406