Html elements details, hgroup, and iframe

details element The HTML details element (<details>) is used as a disclosure widget from which the user the retrieve additional information, 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). These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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details details and hgroup, details, hgroup, and iframe

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