Anchor (no href attribute)
name="top"
Anchor link
href="#top"
Mailto
href="mailto:me@example.com"
Javascript
href="javascript: alert('Hello World!')"
Internal relative
href="../webentwicklung/externe-links-kennzeichnen-mit-css3
Internal absolute
href="http://kau-boys.com/webentwicklung/externe-links-kennzeichnen-mit-css3"
Internal absolute (HTTPS)
href="http://kau-boys.com/webentwicklung/externe-links-kennzeichnen-mit-css3"
External
href="http://www.wordpress.org"
External link on image
WordPress Logo Button