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Use CDP to discover closed shadow roots before DOM serialization. Closed shadow roots are inaccessible from JS (element.shadowRoot === null), but CDP's DOM domain can pierce them. We resolve each closed shadow root to a JS object and store it in a WeakMap that PercyDOM.serialize() reads. - Add expose_closed_shadow_roots() using CDP session - Add _walk_nodes() helper to traverse CDP DOM tree - Skip iframe contentDocument nodes (cross-frame not yet supported) - Non-fatal: catches exceptions for non-Chromium browsers and CDP errors - Called after PercyDOM injection, before DOM serialization - Add tests for walk_nodes, non-Chromium skip, CDP errors, closed roots Ported from percy/percy-playwright#609 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
expose_closed_shadow_roots()using CDP to discover and expose closed shadow roots_walk_nodes()helper for CDP DOM tree traversalPorted from percy/percy-playwright#609
Test plan
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