Changes in HTML 5 - <link/> Tag

What's new in HTML 5

• Many new possible values of the rel attribute have been added.
• Additional values of the rel attribute can be added if they go through a formal approval process. The XFN values have already gone through the process and have been accepted.

In addition, the sizes attribute, used with the rel="icon" relationship, has been added.

Differences between HTML 5 and earlier versions of HTML

The following values of the rel attribute are no longer valid:

• rel="appendix"
• rel="chapter"
• rel="contents" (use rel="index" instead)
• rel="copyright"
• rel="glossary"
• rel="section"
• rel="shortcut icon" (use rel="icon" instead)
• rel="start" (use rel="first" instead)
• rel="subsection"

In ployglot HTML documents the <link/> tag is coded as a self-closing tag the same as in the 2000-2010 Recommendations from the W3C HTML Working Group. Those specifications changed the ending delimiter to /> from > in older recommendations. They also defined the HTML namespace for the link element type name and the names of other HTML element types.