Only Gecko implements them, nobody else seems interested, and they were dropped from the spec. https://drafts.csswg.org/cssom/#changes-from-5-december-2013 https://lists.w3.org/Archives/Public/www-style/2013Aug/0640.html
Can this wait a bit?
Sure. We should probably get warnings in somewhat soon, though.
Well, actually, assuming we don't want to remove the whole alternate stylesheet selection mechanism, it's not really worth blocking bug 1447009 on it...
No longer blocks: 1447009
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