b element Displays the text of the element as boldface text, hgroup element The HTML Headings Group Element (<hgroup>) represents the heading of a section, 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':