Html elements video, iframe, and hgroup

video element The HTML  <video> element is used to embed video content in an HTML or XHTML document, iframe element Defines an inline frame (ie a frame embedded in a document), hgroup element The HTML Headings Group Element (<hgroup>) represents the heading of a section. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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video video and iframe, video, iframe, and hgroup

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