iframe element Defines an inline frame (ie a frame embedded in a document), input element Defines an input element, such as a text field control or button, within a form, 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. 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':