Questions such as this one and particularly this answer point to the standards proposal page here, but it was never actually standardised.
What was the reasoning behind this? Why do we still have to exclusively use vendor prefixes or JavaScript for this?
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chossenger
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Not sure, but FWIW, [it's back in UI level 4](https://drafts.csswg.org/css-ui-4/#content-selection). – BoltClock Aug 01 '15 at 04:18