CSS3 Selectors: markup precomposed, CSS precomposed

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Link to spec
i18n tests

[Exploratory test] A fully precomposed class name will match a fully precomposed CSS selector name.
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

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