For <progress> elements, we should use `block-size: 1em` instead of `height: 1em` and `inline-size: 10em` instead of `width: 10em`. This change will not affect existing behavior for horizontal writing mode (the specced behavior) and help support vertical writing mode. See spec PR: https://github.com/whatwg/html/pull/8471 WPT tests: css/css-writing-modes/progress-appearance-native-computed-style.optional.html css/css-writing-modes/progress-appearance-native-horizontal.optional.html css/css-writing-modes/progress-appearance-native-vertical.optional.html css/css-writing-modes/progress-appearance-none-horizontal.optional.html css/css-writing-modes/progress-appearance-none-vertical.optional.html https://wpt.fyi/results/css/css-writing-modes?label=master&label=experimental&aligned&view=subtest&q=css%2Fcss-writing-modes%2Fprogress
<rdar://problem/102477867>
Pull request: https://github.com/WebKit/WebKit/pull/6747
Committed 262336@main (fd4ac798e708): <https://commits.webkit.org/262336@main> Reviewed commits have been landed. Closing PR #6747 and removing active labels.