Bug 307878

Summary: scoped custom customizes when upgrade called on non-matching registry.
Product: WebKit Reporter: Steve Orvell <steveorvell>
Component: DOMAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: rniwa
Priority: P2    
Version: Safari Technology Preview   
Hardware: Mac (Apple Silicon)   
OS: macOS 26   
Bug Depends on:    
Bug Blocks: 154907    
Attachments:
Description Flags
Unexpected custom element customization none

Steve Orvell
Reported 2026-02-13 18:08:41 PST
Created attachment 478345 [details] Unexpected custom element customization See the attached reproduction. When `registry2.upgrade` is called on an un-upgraded element defined in a different registry, the element unexpectedly upgrades.
Attachments
Unexpected custom element customization (878 bytes, text/html)
2026-02-13 18:08 PST, Steve Orvell 		no flags
Details
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