To HTML Content Category Phrasing

Html elements mark, iframe, and bdo

mark element The HTML Mark Element (<mark>) represents highlighted text, i, iframe element Defines an inline frame (ie a frame embedded in a document), bdo element Specifies the text direction for the document. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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mark mark and iframe, mark, iframe, and bdo

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