B The B element indicates bold text. Where bold typography is unavailable, an alternative representation may be used. Where italic typography is unavailable, an alternative representation may be used. Where a teletype font is unavailable, an alternative representation may be used. At least one of the NAME and HREF attributes should be present.
NAME gives the name of the anchor , and makes it available as a head of a hyperlink .
The value is a whitespace separated list of relationship names. The semantics of link relationships are not specified in this document. REV same as the REL attribute, but the semantics of the relationship are in the reverse direction. An anchor may have both REL and REV attributes. URN specifies a preferred, more persistent identifier for the head anchor of the hyperlink .