NEW78494
When transforms are transitioned to cause overflow, scrollbars do not appear until transition finishes 
https://bugs.webkit.org/show_bug.cgi?id=78494
Summary When transforms are transitioned to cause overflow, scrollbars do not appear ...
Boris Zbarsky
Reported 2012-02-13 06:37:21 PST
See https://bugzilla.mozilla.org/attachment.cgi?id=596623 for a testcase. Gecko and Presto get this right: the scrollbar appears once there is overflow.
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Simon Fraser (smfr)
Comment 1 2012-02-13 19:04:51 PST
This is somewhat by design. We don't want to slow down accelerated transform animations by having to recompute overflow for every frame. Perhaps we could recompute overflow at the start of the transition, using the final transform value though.
Boris Zbarsky
Comment 2 2012-02-13 19:08:49 PST
If you think the spec should allow this behavior, then it should probably do so explicitly...
Ahmad Saleem
Comment 3 2023-08-16 15:25:35 PDT
WebKit ToT (266957@main) only get 'horizontal' scrollbar once the 'text' go out of window view while Firefox Nightly 118 and Chrome Canary 118 show 'horizontal' scrollbar from start.
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