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Expose implemented legacy editing command capabilities #443
Description
Parent: #268. Webview epic: #264.
Proven gap
Unchanged Code OSS probes document.queryCommandSupported('copy'|'cut'|'paste') before enabling its clipboard actions, and forwards Select All through the same legacy editing-command surface. WebScene implements bounded execCommand paths but exposes no queryCommandSupported method, so capability detection can disable commands that the native runtime supports.
Focused scope
- Expose a browser-shaped, non-constructible
Document.queryCommandSupportedoperation in top-level, initial iframe, and navigated iframe realms. - Report only the commands WebScene actually implements: copy, cut, paste, and selectAll.
- Preserve case-insensitive DOMString conversion and receiver checks.
- Add no clipboard or host authority.
Deferred validation debt
Under the current implementation-only directive, merge without waiting for new Chromium/WPT/native/performance/CI evidence. Follow-up acceptance must cover descriptors, invalid receivers and coercion, all document realm kinds, replacement/detach cleanup, exact Code OSS clipboard feature detection, and repeated-call memory/latency bounds.
Non-overlap
Do not touch consolidation PR #76, AppScene, vscode-demo, CSS, filesystem, input routing, or accessibility publication.
Activity
wieslawsoltes commentedon Sep 18, 2026
Completed by #445, merged as
4ea2feebd0dd7f2f08dfa1a8bfbbe1ca5f3d6c3bfrom implementation heade6d1428aaf69fe08595963b761f711fc532a2a6a.Top-level, initial iframe, navigated iframe, and detached HTML document realms now expose non-constructible
Document.queryCommandSupported. It reports only the bounded commands WebScene implements: copy, cut, paste, and selectAll, with case-insensitive DOMString conversion and existing receiver enforcement. No authority changed.Validation debt remains explicit: no new Chromium/WPT oracle, native regression, performance, memory, lifecycle, package, or CI evidence was run under the implementation-only directive. Required follow-up is the matrix recorded in this issue.