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August 26, 2026 15:34
Preserve intentionally null element registries during cloning and adoption. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 3f70b8c0-52a8-4e9e-a5a9-a8d2a1b8e925
Do not propagate a fallback registry into descendants of an element whose null registry is intentionally preserved. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 3f70b8c0-52a8-4e9e-a5a9-a8d2a1b8e925
Only preserve a null fallback boundary while the flagged element itself still has a null custom element registry. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 3f70b8c0-52a8-4e9e-a5a9-a8d2a1b8e925
This was referenced Aug 26, 2026
Keep the associated value definition concise and move cloning and adoption rationale into the adjacent note. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 3f70b8c0-52a8-4e9e-a5a9-a8d2a1b8e925
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Introduce an element-level
keep custom element registry nullflag so HTML can preserve intentionally null custom element registries through cloning and adoption.(See WHATWG Working Mode: Changes for more details.)
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