Add scoped custom element registry example - #463
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`position-area` in a `:host` rule positions the shadow host, which lives in the outer tree, but the generated `--pa-value-*` mapping rule was inserted into the roots being polyfilled. A `<style>` in a shadow root never matches that root's own host, so the values stayed undefined and the host was left unpositioned. Record the style container of each target while the rules are generated, and insert the stylesheet into those containers instead. Targets inside a polyfilled shadow root resolve to the same container as before. Refs oddbird#444 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Add AgentScan workflow
…-host fix: insert position-area mapping styles into each target's own root
fix: inline styles were not being shifted to custom properties
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As i said in #459 (comment), i don't think this example currently adds anything. There are no browsers that don't support CSS Anchor Positioning v1, but do support Scoped Custom Element Registries.