When opening: data:text/html,<div style="width: 200px; height: 200px; background: red; overflow: auto; resize: both; writing-mode: vertical-rl"></div> or data:text/html,<div style="width: 200px; height: 200px; background: red; overflow: auto; resize: both; direction: rtl"></div> The resizer is on the left side (as expected), however, resizing is really funky and goes really fast.
<rdar://problem/102620110>
Is it by any chance this code: https://github.com/WebKit/WebKit/blob/4ea2d50a5f28aa5b54ae68064d9421f3cc0b1060/Source/WebCore/rendering/RenderLayerScrollableArea.cpp#L1507
Pull request: https://github.com/WebKit/WebKit/pull/17879
Committed 268157@main (51184f8a009b): <https://commits.webkit.org/268157@main> Reviewed commits have been landed. Closing PR #17879 and removing active labels.