The font-size-adjust CSS property only works for the GTK port only when the Ahem font is used. If non-Ahem (Arial, Verdana, etc) fonts are specified, the adjusting CSS property does not work.
Pull request: https://github.com/WebKit/WebKit/pull/11704
Committed 262061@main (9bd41e74f05f): <https://commits.webkit.org/262061@main> Reviewed commits have been landed. Closing PR #11704 and removing active labels.