RESOLVED FIXED 282007
[Site isolation] Site isolated frames with css transform are not displayed correctly 
https://bugs.webkit.org/show_bug.cgi?id=282007
Summary [Site isolation] Site isolated frames with css transform are not displayed co...
Said Abou-Hallawa
Reported 2024-10-23 15:24:59 PDT
1. Enable site isolation internal feature 2. Open https://bug1519412.bmoattachments.org/attachment.cgi?id=9035934 Result: The contents of the cross origin iframe is transformed incorrectly. Expected: The contents of the cross origin iframe should cover the whole site isolated frame.
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Radar WebKit Bug Importer
Comment 1 2024-10-23 15:25:22 PDT
<rdar://problem/138513187>
Said Abou-Hallawa
Comment 2 2024-10-23 16:00:21 PDT
It looks like the problem with the scaling. For a page like this <style> iframe { width: 600px; height: 300px; transform: scale(0.5); transform-origin: 0 0; } </style> <body> <iframe src="http://localhost:8000/site-isolation/resources/green-background.html" frameborder=0></iframe> </body> It is expected to render { 300 x 150 } green rectangle for the iframe because its size is { 600 x 300 } and it has transform of scale(0.5). But we end up having { 150 x 75 } green rectangle. So it seems the scaling is applied twice.
Said Abou-Hallawa
Comment 3 2024-10-28 13:56:07 PDT
Pull request: https://github.com/WebKit/WebKit/pull/35821
EWS
Comment 4 2024-10-29 10:10:04 PDT
Committed 285842@main (b27e4007cd73): <https://commits.webkit.org/285842@main> Reviewed commits have been landed. Closing PR #35821 and removing active labels.
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