To HTML Content Category Phrasing

Html elements cite, iframe, and em

cite element Specifies that the enclosed text is a citation from another source, iframe element Defines an inline frame (ie a frame embedded in a document), em element Specifies that the enclosed text should be emphasized. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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cite cite and iframe, cite, iframe, and em

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