Fixed code style issues.
Removed unnecessary code for old Opera.
Docs.
Merge branch 't/11114-initial-cleanup'
Delay any selection movement after drop, so it won't disappear on FF.
Changelog entry.
Merge branch 't/11132'
QM in IE10+ should be handled as standards mode.
Improved env#quirks docs.
Changelog entry.
Merge branch 't/11182'
Move figure and figcaption styles from image2 to global contents.css.
Added missing contents stylesheet for inline editor in dev sample.
Removed caption class from figure selector to make it generic.
Changelog entry.
Merge branch 't/11204'
Fixed: Empty snapshot recorded after resizing because DOM changed after mouseup.
Changelog entry.
Merge branch 't/11077'
When creating fake selection for non-editables, we need to perform range shrink.