docs(accessibility): add a page on the inert attribute#60
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Adds src/content/spec/accessibility/inert-attribute.md documenting the WHATWG HTML `inert` global attribute — Baseline Widely Available since April 2023 — as the declarative replacement for focus-trap scripting when an overlay is open. Status: recommended (the platform does not break without it; modal <dialog> supplies it automatically). Wires inert-attribute into the relatedSlugs of keyboard-navigation, focus-indicators, skip-links, and native-interactive-elements; adds the changelog entry and OG images. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Adds a new spec page — The inert attribute — under
accessibility.inertis a boolean global attribute that makes an element and its descendants non-interactive: removed from the tab order, removed from the accessibility tree, unfocusable, and skipped by find-in-page. It is the declarative replacement for the fragile focus-trap scripting authors used to write to keep keyboard and screen-reader focus inside an open dialog/menu/panel.Why now
inert. It sits naturally in the focus-management cluster alongsidekeyboard-navigation,focus-indicators, andskip-links.aria-hiddenalone hides background content from screen readers but leaves it focusable, so keyboard focus still escapes an overlay.inertfixes both at once.Status
recommended— the web platform contract does not break without it (a modal<dialog>opened withshowModal()already makes the rest of the document inert automatically), but a modern site should use it for non-<dialog>overlays. Notrequired.Primary sources
Also in this PR
inert-attributeintorelatedSlugsof keyboard-navigation, focus-indicators, skip-links, native-interactive-elements.added) for 2026-06-26.npm run buildpasses (151 pages indexed). Opened as a draft for maintainer review — not for auto-merge.🤖 Generated with Claude Code