audio element The audio element is used to embed sound content in an HTML or XHTML document, command element The command element represents a command which the user can invoke, strong element Specifies that the enclosed text should be rendered in the browser as "strong" (usually bold) text. 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':