To HTML Content Category Interactive

Html elements iframe, hgroup, and base

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, base element Specifies a base URL for all of the relative URLs in the document to use. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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iframe iframe and hgroup, iframe, hgroup, and base

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