• Content that makes an element non-empty by providing either some descendant non-empty text, or else something users can hear (audio elements) or view (video, img, or canvas elements), or otherwise interact with (for example, interactive form controls). That elements whose content model allows flow content or phrasing content should have at least one node in its contents that is palpable (and that does not have the hidden attribute specified) is not a hard requirement. ← HTML

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