GO-2026-6866

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GO-2026-6866

Summary: Check all ancestor namespace transitions when rendering raw text in html in golang.org/x/net

Details: In childTextNodesAreLiteral, walking up the tree previously stopped at the nearest foreign ancestor once an HTML integration point was found. However, that integration point may itself be a descendant of an element that was foster-parented into a foreign namespace (such as <mglyph> or <malignmark> fostered under <mtext>), causing a parser to resolve the subtree in a different foreign namespace upon re-parsing the rendered output. Continue walking the full ancestor chain and verify that every transition from a non-empty namespace occurs at an HTML integration point before emitting literal text.

References: https://go.dev/cl/855121, https://go.dev/issue/82622, https://groups.google.com/g/golang-announce/c/sqrs2vTx_Xs