Individual skill
custom-element-accessibility
Use when reviewing custom element class definitions or Web Component source code to check for missing ARIA reflection, keyboard handling, and form association.
skills/custom-element-accessibility/SKILL.md
Source commit e8d14d049010e2ce25afcd5e8609dfcbbe63e47e
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- Observed behavior
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- Last checked
- Nov 9, 2026
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- Repository last updated
- Oct 31, 2026
- License
- MIT
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- frontend Repository topic
- front-end-development Repository topic
- front-end-developer-tool Repository topic
- guidelines Repository topic
- checklist Repository topic
- reference Repository topic
- web-development Repository topic
- html Repository topic
- css Repository topic
- javascript Repository topic
- engineering Derived category
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SKILL.mdcore · 2,619 bytesSKILL.mdcore · 2,619 bytesreferences/rule.mddoc · 8,834 bytes
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# Make custom elements and Web Components accessible
Custom elements that lack ARIA reflection are invisible to screen readers — a button that looks correct visually may be announced as a generic "group" or not at all. ElementInternals provides the bridge between the shadow DOM and the accessibility tree, and it is also the only standards-compliant way to integrate custom inputs with native HTML forms.
## Quick Reference
- Prefer native `<button>`, `<input>`, `<select>`, and `<details>` before building a custom widget
- Use ElementInternals.ariaRole to expose ARIA semantics from the shadow DOM
- Implement form-associated custom elements with ElementInternals for native form participation
- Apply roving tabindex for compound widgets (listbox, toolbar, menu)
- The shadow DOM does not automatically expose ARIA to the accessibility tree without ElementInternals
## Check
