1950161 - Firefox doesn't support webkit-prefixed pseudo-element selectors for parts of input type=range (::-webkit-slider-runnable-track, ::-webkit-slider-thumb)

Status: NEW

(Core :: Layout: Form Controls, defect)

Description

[Daniel Holbert [:dholbert]]

Filing this as a tracking bug for issues caused by sites depending on the webkit-prefixed spellings of the pseudo-elements that make up an <input type="range"> widget:

::-webkit-slider-runnable-track
::-webkit-slider-thumb

Comment 2

[Daniel Holbert [:dholbert]]

As noted in dupe bug 1971220 comment 0: we previously added experimental support for these pseudos in bug 1735575, but we had to turn off that experimental support in bug 1843040. So: "just" aliasing these has been tested and is not workable for now at least, due to differences in our implementation of slider widgets. So I'm not sure if we've got a workable way forward to implement these; but we need a bug to track this platform difference vs. WebKit/Chromium-based browsers so that we can properly classify webcompat bugs that boil down to this. So, this bug is serving that role for now, and depending on the level of breakage, we can explore alternate approaches (and/or interventions) as-needed.

Comment 3

[Woody Li]

See also
https://github.com/mozilla/wg-decisions/issues/1257