Currently there is a single Slider class which bakes in the appearance to a large extent. There should be a way for Slider subclasses to exist.
Pull request: https://github.com/WebKit/WebKit/pull/1777
Committed 251872@main (b6fe39f037b1): <https://commits.webkit.org/251872@main> Reviewed commits have been landed. Closing PR #1777 and removing active labels.
<rdar://problem/95984491>