iframe element Defines an inline frame (ie a frame embedded in a document), keygen element The HTML keygen element exists to facilitate generation of key material, and submission of the public key as part of an HTML form, kbd element Specifies that the enclosed text should be formatted as keyboard input. 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':