Our implementation is totally not what the spec says, but totally what other
UAs do, see https://github.com/w3c/csswg-drafts/issues/2474.
So given this is causing webcompat pain, I think we should be pragmatic and just
unprefix this.
We could keep serialization and getComputedStyle with ::selection working with a
bit more effort, like we do for :-moz-placeholder, but I'd prefer not doing at
least the serialization bit, and just alias in nsCSSPseudoElements
:-moz-selection to selection too.
MozReview-Commit-ID: 6lxctozRDqv
Emilio Cobos Álvarez
3c6e3ea3a0