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unique-id

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Use when reviewing templates, rendered HTML, or shared components related to Ensure all IDs are unique. Validate the final browser-facing markup, not just the source framework abstraction.

skills/unique-id/SKILL.md

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# Ensure all IDs are unique

Duplicate IDs break form accessibility (labels don't connect), ARIA relationships fail, and JavaScript getElementById returns wrong elements—causing silent bugs.

## Quick Reference

- Each ID must appear only once per HTML document
- Use classes for styling, IDs for unique anchors/references
- Check for duplicates introduced by component libraries
- Duplicate IDs break form labels, ARIA, and getElementById

## Check

Scan this HTML document to ensure all ID attributes are unique across the entire page and properly reference related elements.
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