https://crbug.com/595210

Closes #17338
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Refs #14839, #19088
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Closes #19532
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Sounds like IE11 isn't getting non-critical fixes anymore, so there's no point in mentioning it (just like there's no point in mentioning IE10).
Help us, Edge-Wan Kenobi! You're our only hope.
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http://bugzil.la/1139853 was resolved as a duplicate of http://bugzil.la/924068
Refs #15990
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The modal backdrop positioning bug related to iOS' virtual keyboard doesn't seem to reproduce in iOS 8.0+.
(Possibly as a side-effect of https://bugs.webkit.org/show_bug.cgi?id=153224 )
Refs #9023
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* https://bugs.chromium.org/p/chromium/issues/detail?id=273306
* https://bugs.webkit.org/show_bug.cgi?id=138192
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https://bugs.chromium.org/p/chromium/issues/detail?id=175502
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Refs https://bugzilla.mozilla.org/show_bug.cgi?id=1217012
Refs #19393
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https://bugzilla.mozilla.org/show_bug.cgi?id=1253468
Closes #19390
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/fyi @mdo

Note: The selector in dashboard.css that used .page-header was superfluous
    because the margin that it zeroed was already zero even without that declaration.

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RIP code.google.com
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Fixes #18493
Closes #18836
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Add documentation to components/utilities to publicly expose the
.pos-f-t utility class to users.

Closes #18799
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It's very handy to add another spacer size (e.g. `4`) which can easily be done by extending the map.
Example:
```
$spacers: (
  0: (
    x:   0,
    y:   0
  ),
  1: (
    x:   $spacer-x,
    y:   $spacer-y
  ),
  2: (
    x:   ($spacer-x * 1.5),
    y:   ($spacer-y * 1.5)
  ),
  3: (
    x:   ($spacer-x * 3),
    y:   ($spacer-y * 3)
  ),
  4: (
    x:   ($spacer-x * 5),
    y:   ($spacer-y * 5)
  )
);
```

Closes #18706
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Ports #18872 to v4
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Fixes #17584
Closes #17607 by merging it

- Add/replace callout for color and AT with include