Update backdrop explainer for JS#130
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annevk
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May 6, 2026
Restructure the explainer around the JavaScript API on the <model> element (requestImmersive / exitImmersive), moving the previous declarative <link rel="spatial-backdrop"> design to "Alternative Considered". The imperative approach gives the page ownership of the activation UI, awareness of the current immersive state via immersivechange and a handle for controlling the backdrop after it is presented (entityTransform, environment map swaps, model animations). --------- Co-authored-by: Marcos Caceres <marcosc@apple.com>
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Restructure the explainer around the JavaScript API on the element (requestImmersive / exitImmersive), moving the previous declarative design to "Alternative Considered".
The imperative approach gives the page ownership of the activation UI, awareness of the current immersive state via immersivechange and a handle for controlling the backdrop after it is presented (entityTransform, environment map swaps, model animations).