These supported tags come from the WordPress.com code FAQ.

Address Tag

Anchor Tag (aka. Link)
This is an example of a link.

Abbreviation Tag
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.

Cite Tag
“Code is poetry.” —Automattic

Code Tag
You will learn later on in these tests that word-wrap: break-word; will be your best friend.

Delete Tag
This tag will let you strikeout text, but this tag is no longer supported in HTML5 (use the <strike> instead).

Emphasize Tag
The emphasize tag should italicize text.

Insert Tag
This tag should denote inserted text.

Keyboard Tag
This scarsly known tag emulates keyboard text, which is usually styled like the <code> tag.

Preformatted Tag
This tag styles large blocks of code.

.post-title {
	margin: 0 0 5px;
	font-weight: bold;
	font-size: 38px;
	line-height: 1.2;
	and here's a line of some really, really, really, really long text, just to see how the PRE tag handles it and to find out how it overflows;
}

Quote Tag
Developers, developers, developers… –Steve Ballmer

Strike Tag (deprecated in HTML5)
This tag shows strike-through text

Strong Tag
This tag shows bold text.

Subscript Tag
Getting our science styling on with H₂O, which should push the “2” down.

Superscript Tag
Still sticking with science and Isaac Newton's E = MC², which should lift the 2 up.

Teletype Tag (deprecated in HTML5)
This rarely used tag emulates teletype text, which is usually styled like the <code> tag.

Variable Tag
This allows you to denote variables.

This is a paragraph. It is justify aligned. It gets really mad when people associate it with Justin Timberlake. Typically, justified is pretty straight laced. It likes everything to be in it's place and not all cattywampus like the rest of the aligns. I am not saying that makes it better than the rest of the aligns, but it does tend to put off more of an elitist attitude.

Feels good to be right all the time.