CSS.escape is an API defined at
http://dev.w3.org/csswg/cssom/#the-css.escape%28%29-method which allows
web pages to create a valid CSS identifier that will parse to a given
string. A typical use case is:
document.querySelector('#' + CSS.escape(stringIDontControl))
Unless there are objections, I'm going to check this in without a
preference, for Firefox 31. The spec for this is very straightforward
and not likely to change, apart from the feature disappearing altogether
or something. But I think this feature is pretty much necessary in some
form, whether built into the platform or as a library, to safely use
querySelector-like APIs with non-literal strings.
Bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=955860
Please let me know if there are objections.
-Boris
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