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Add support for the attr() function in CSS content property values,
enabling patterns like `content: " (" attr(href) ")"` on ::before/::after
pseudo-elements. The implementation parses attr() at CSS parse time into
ContentValue::Items, then resolves attribute references against the DOM
during pseudo-element style computation, converting to ContentValue::String
before layout sees it.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>