HTML Headings
Heading 1 - <h1>...</h1>
Heading 2 - <h2>...</h2>
Heading 3 - <h3>...</h3>
Heading 4 - <h4>...</h4>
Heading 5 - <h5>...</h5>
Heading 6 - <h6>...</h6>
Heading 7 - <h7>...</h7>
Heading 8 - <h8>...</h8>
As you can see, there are only 6 predefined heading levels.
Alignment
Heading tags may contain alignment parameters or they may be included in a <center>...</center> block.
<h2 align=center>...</h2>
<h2 align=right>...</h2>
<h2 align=left>...</h2>
<center><h2>...</h2></center>
(align=right is not implemented in IE 4.40)