Jekyll 3.x has it as a dependency already.

Make hound fail on violations

Wall of Browser Bugs: Stop mentioning IE11

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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Add native title tooltip IE11/Edge bug to wall of browser bugs

Travis CI: Remove now-unused $GEMDIR env var

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Remove the now unused btoa dependency.

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Also switch to `^`.

Docs: Link directly to printing-related browser bugs

* https://bugs.chromium.org/p/chromium/issues/detail?id=273306
* https://bugs.webkit.org/show_bug.cgi?id=138192
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Docs: Add link to Chrome bug regarding `body { overflow: hidden; }`

https://bugs.chromium.org/p/chromium/issues/detail?id=175502
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Introduction for using table-reflow

For consistency with the rest of the file
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Neutralize link styles for placeholder links/named anchors

Remove Wall of Browser Bugs entry for #19390

Refs https://bugzilla.mozilla.org/show_bug.cgi?id=1217012
Refs #19393
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Add Wall of Browser Bugs entry for #19390

https://bugzilla.mozilla.org/show_bug.cgi?id=1253468
Closes #19390
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Added colon before enumeration
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This reverts commit d0059ac2.

Node.js 5.7.1 is out with the issue fixed.

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Example pages: Remove usages of defunct .page-header class

/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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JS visual tests: Remove usages of defunct .page-header class

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