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Extension UI Theming Breaking Across Host Page CSS Environments : Cross-Context Consistency for Ephemeral UIs
TypeScriptShadow DOMConstructable StylesheetsPlaywright
Problem Breakdown
The consistency defect is that UI surfaces (popups, panels, widgets) mount and unmount against a background state that keeps changing, and the UI's snapshot-and-act model has no protocol for staying consistent with that moving state. Extension UI injected into pages (shadow-DOM widgets, sidebars, floating panels) inher…
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