Format reference

CSS Format Hub

CSS (.css) stylesheets define presentation rules for HTML and XML documents using selectors, properties, and values. They support layouts, animations, and responsive design features. Use sample .css files to test preprocessing, injection, specificity handling, and stylesheet merging.

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text/css
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Implementation Notes

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Use the manifest endpoint for deterministic fixture selection in CI, then validate MIME/type detection against actual parser output.

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