iframe element Defines an inline frame (ie a frame embedded in a document), wbr element For a block of text enclosed by nobr tags, indicates a place where a line break may occur, cite element Specifies that the enclosed text is a citation from another source. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.
Click the html element name in the punctuation list to advance the example in 'Tryit-Editor':