br element Specifies a hard line break in the text, hgroup element The HTML Headings Group Element (<hgroup>) represents the heading of a section, base element Specifies a base URL for all of the relative URLs in the document to use. 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':