Bug 274799

Summary: [view-transitions] View transitions can create arbitrary numbers of pseudo elements for the document element which are slow to restyle
Product: WebKit Reporter: Matt Woodrow <mattwoodrow>
Component: CSSAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: koivisto, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on: 274739    
Bug Blocks:    
Attachments:
Description Flags
Testcase none

Matt Woodrow
Reported 2024-05-28 14:41:53 PDT
Created attachment 471533 [details] Testcase Style invalidation operates on Element, which triggers resolution of style for that Element and all attached pseudos. View transitions can create an arbitrary set of pseudo elements, which then all get restyled for any change to any of the pseudo styles. Attached is a test case that creates ~800 pseudo elements in a view transition, and only makes real changes to one of them. Bug 274739 improved some O(n^2) behaviour here, but it's still slow due to the sheer number of elements that get restyled.
Attachments
Testcase (14.65 KB, text/html)
2024-05-28 14:41 PDT, Matt Woodrow 		no flags
Details
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Radar WebKit Bug Importer
Comment 1 2024-06-04 14:42:13 PDT
<rdar://problem/129242996>
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