To HTML Content Category Interactive

Html elements select, video, and em

select element Defines a selection list control in a form, video element The HTML  <video> element is used to embed video content in an HTML or XHTML document, em element Specifies that the enclosed text should be emphasized. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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select select and video, select, video, and em

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