These supported tags come from the WordPress.com code FAQ.
Address Tag1 Infinite Loop
Cupertino, CA 95014
Anchor Tag (aka. Link)
This is an example of a link.
The abbreviation srsly stands for “seriously”.
Acronym Tag (deprecated in HTML5)
The acronym ftw stands for “for the win”.
Big Tag (deprecated in HTML5)
These tests are a big deal, but this tag is no longer supported in HTML5.