Html elements iframe, hgroup, and wbr

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, wbr element For a block of text enclosed by nobr tags, indicates a place where a line break may occur. 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 wbr

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