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Use when auditing metadata, crawlability, structured data, or indexability related to Fix malformed HTML structure. Verify the rendered HTML and HTTP response rather than relying only on source files.
Passed 0 of 22 test cases with the skill, and 22 of 22 without it.
0 fixed21 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.
The instructions your model reads when the skill loads.
Malformed HTML can cause rendering issues across browsers and may prevent search engine crawlers from accurately parsing and indexing your content.
Validate the HTML structure of the page to identify any unclosed tags, incorrect nesting, or structural errors.
Correct the malformed HTML by properly closing tags and ensuring all elements are nested according to the HTML5 specification.
Explain how significant HTML errors can impact search engine bot crawling and the accessibility of a website.
Review metadata generation, rendered HTML, structured data, and response headers related to Fix malformed HTML structure. Flag exact routes or templates where search-facing output violates the rule, and describe how to verify the final page output.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/seo/broken-html
test cases passed, vs 22 / 22 without
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