Bug 278043

Summary: 3D Rotation on a sibling element causes text to render blurry (bitmap scaled)
Product: WebKit Reporter: Jonathan Deutsch <jonathan>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: bfulgham, jonathan, karlcow, mattwoodrow, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: BrowserCompat, InRadar
Version: Safari 17   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.webkit.org/show_bug.cgi?id=27684
Attachments:
Description Flags
Blurry text
none
rendering in safari, firefox, chrome none

Jonathan Deutsch
Reported 2024-08-13 14:01:48 PDT
Created attachment 472144 [details] Blurry text See this code: <div style="position: absolute; transform: scale(4);"> <div style="position: absolute; width: 10px; height: 10px; background-color: black; transform: rotateY(15deg);"></div> <div style="position: absolute; font-size: 54px;">Not Crisp!</div> </div> There is a scaled parent and two siblings. One sibling has a 3D rotation. The other has text. The 3D rotation causes the text to be rendered in a scaled (blurry) mode. Screenshot attached. If the 3D rotation is removed, the text is rendered as sharp. I would not expect a sibling element to affect the rendering here. Chrome and Firefox do not have this issue. I tested this on Safari Technology Preview Release 199 using macOS 14.6 (23G80). I haven't tested on other versions.
Attachments
Blurry text (148.43 KB, image/png)
2024-08-13 14:01 PDT, Jonathan Deutsch 		no flags
Details
rendering in safari, firefox, chrome (234.58 KB, image/png)
2024-08-14 01:19 PDT, Karl Dubost 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Karl Dubost
Comment 1 2024-08-14 01:19:02 PDT
Created attachment 472149 [details] rendering in safari, firefox, chrome This is the rendering on a 1x screen This is less worse on a retina screen, but still very different than Firefox and Chrome.
Radar WebKit Bug Importer
Comment 2 2024-08-14 01:20:49 PDT
<rdar://problem/133824432>
Karl Dubost
Comment 3 2024-08-14 01:22:09 PDT
tested on Safari Technology Preview 200 20620.1.1 Firefox Nightly 131.0a1 13124.8.12 Google Chrome Canary 129.0.6656.0 6656.0
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