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Define the provisional html-in-canvas feature descriptor, snapshot lifecycle, target-ray hit testing, and pointer event routing for immersive sessions. Add design documentation and mark the HTML-in-Canvas additions unstable, with issues tracking unresolved Pointer Events integration details.
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HTML-in-Canvas content is same-origin, so the WebXR hit-test hook can use the snapshot's recorded DOM and CSS state without applying read-back-allowed rendering restrictions.
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First stab at defining hit testing of HTML content using html-in-canvas in WebXR.
/tpac
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