Html elements hgroup, iframe, and select

hgroup element The HTML Headings Group Element (<hgroup>) represents the heading of a section, iframe element Defines an inline frame (ie a frame embedded in a document), select element Defines a selection list control in a form. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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hgroup hgroup and iframe, hgroup, iframe, and select

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