Hi,
In bug 1480054 I intend to avoid exposing the XUL ::-moz-tree
pseudo-elements to content pages in Nightly and Early beta, with the
hope of eventually riding to release.
The reasoning for that is, apart of them being non-standard and such,
that they're the only pseudo-elements (except ::slotted which is
different) that accept arguments, and that they're somewhat complex.
With the different efforts to move away from XUL it'd be nice if we
could simplify it / remove them eventually. This is the first step
towards that.
Of course, there's the non-zero chance of people using it to apply rules
only to Firefox and such, so that's why I want to start restricting this
only to Nightly / Early beta for now.
Let me know if there's any objection to this, thanks!
-- Emilio
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