https://drafts.csswg.org/css-scrollbars-1/#scrollbar-width Accepted values are "auto | thin | none".
Pull request: https://github.com/WebKit/WebKit/pull/13992
Committed 264214@main (98d2001782e5): <https://commits.webkit.org/264214@main> Reviewed commits have been landed. Closing PR #13992 and removing active labels.
<rdar://problem/109533618>