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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.
Passed 21 of 22 test cases with the skill, and 20 of 22 without it.
2 fixed19 passed either way0 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
This benchmark measured an earlier version of the skill.
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
Explain the WHATWG HTML specification requirement regarding the `id` attribute's uniqueness scope within a document.
| Checked | Without skill | With skill |
|---|---|---|
| States that the id attribute value must be unique among all IDs in the entire HTML document tree | Missed | Passed |
The instructions your model reads when the skill loads.
Duplicate IDs break form accessibility (labels don't connect), ARIA relationships fail, and JavaScript getElementById returns wrong elements—causing silent bugs.
Scan this HTML document to ensure all ID attributes are unique across the entire page and properly reference related elements.
Remove duplicate ID values, ensure each ID is used only once per page, and update any references like labels, ARIA attributes, or JavaScript selectors.
Explain why unique IDs are essential for HTML validity, accessibility (form labels, ARIA), JavaScript functionality, and CSS styling.
Review templates, server-rendered HTML, and shared components that output markup related to Ensure all IDs are unique. Flag exact elements, attributes, and routes where the rendered HTML violates the rule.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/html/unique-id
test cases passed, vs 20 / 22 without
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