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Resolve reflected URLs from the owning document base - #905
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This was referenced Sep 21, 2026
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The nested Code OSS Markdown prelude owns
./fake.htmlunder a virtual HTTPS document, but its reflected iframesrcwas resolved against the caller's loopback document. This fixes URL-valued element getters to use the owning document base, including<base>changes, without rewriting authored attributes or changing navigation/security paths.The focused native iframe lifecycle gate passes with connected nested
href/srcregression assertions, 100 lifecycle cycles, flat heap, and a 1 MiB replacement p95 of 3.73 ms against the existing 250 ms limit. The checked-in Chrome reference returnsPASS. The full nested WPT matrix and actual Markdown painting remain tracked in #904, #267 and #903; this PR does not close them. Details:docs/validation/owner-document-url-reflection-904.md.