Summary: This is an unprefixed form of Element.mozMatchesSelector, which
we've been shipping for a long time.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=886308
Link to standard: http://dom.spec.whatwg.org/#dom-element-matches
(though note
<http://lists.w3.org/Archives/Public/www-dom/2014JulSep./0062.html>,
which is more internal standard bookkeeping than issues about how the
method _should_ behave).
Platform coverage: All platforms.
Estimated or target release: Firefox 34.
Preference behind which this will be implemented: Just going to ship this.
-Boris
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