Html elements abbr, hgroup, and video

abbr element Specifies that a string is an abbreviation for a longer word or phrase, hgroup element The HTML Headings Group Element (<hgroup>) represents the heading of a section, video element The HTML  <video> element is used to embed video content in an HTML or XHTML document. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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abbr abbr and hgroup, abbr, hgroup, and video

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