docs(a11y): native single-open accordions via details name#83
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Group sibling <details> by a shared name for a JS-free exclusive accordion — native keyboard, focus, and disclosure semantics, and open state that survives back/forward navigation. Interoperable across all engines (Firefox shipped it in 130). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What changed
Extends the Native interactive elements accessibility page to cover grouping
<details>elements by a sharednameattribute — the native single-open (exclusive) accordion pattern. Adds a workedHow to implementsubsection, aCommon mistakesbullet, and bumpsupdated.Why now
name-grouping behaviour is interoperable across every engine, verified via MDN BCD (html.elements.details.name): Chrome/Edge 120 and Safari 17.2 (Dec 2023), Firefox 130 (Sep 2024). Standard-track, non-experimental.<details>/<summary>as the native disclosure primitive and shows::details-contentanimation, but never mentions that a sharednamegives you a JS-free single-open accordion — the most common accordion requirement.Auditable outcome, not a build technique
Passes the outcome-not-technique bar (the one tightened on 2026-07-06). The "Why it matters" is phrasable for visitors, not the developer: a native single-open accordion gets keyboard activation, correct focus order,
aria-expanded/disclosure semantics, open-state that survives back/forward navigation and in-page find, and graceful degradation with JS disabled — none of which adiv+class-toggle accordion provides.Primary source
detailselement /attr-details-name(already cited on the page).Status / changelog
changedenrichment of an existingrecommendedpage.changedchangelog entry (2026-07-08-exclusive-accordion.md). This changelog call is borderline per CLAUDE.md — if you'd rather not surface a single-subsection addition in/changelog/, drop that one file before merge.Notes for the reviewer
eslint+prettier --checkpassed via the pre-commit hook.npm run buildcould not be run in the sandboxed routine environment (npm is blocked there) — CI is the build gate; please confirm the build is green before merging.🤖 Generated with Claude Code