There are some tests failing because of that: * imported/w3c/web-platform-tests/css/css-flexbox/percentage-heights-016.html * imported/w3c/web-platform-tests/css/css-flexbox/percentage-heights-017.html * imported/w3c/web-platform-tests/css/css-flexbox/percentage-heights-018.html
Note that this is controversial. I've filled [1] against the CSS specs in order to clarify it. [1] https://github.com/w3c/csswg-drafts/issues/6822
<rdar://problem/85707621>
Safari Technology Preview 156 still fail following tests along with percentage-heights-014.html https://wpt.fyi/results/css/css-flexbox?label=master&label=experimental&aligned&view=subtest&q=percentage-height