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Html elements keygen, video, and a

keygen element The HTML keygen element exists to facilitate generation of key material, and submission of the public key as part of an HTML form, video element The HTML  <video> element is used to embed video content in an HTML or XHTML document, a element Specifies either a hyperlink or a target for a hyperlink. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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