A document generally should have exactly one H1 element to mark the most important heading. Possible values are left , right , center , and justify .
Style sheets provide greater flexibility in suggesting alignment.
Visual browsers typically render H1 in a large, bold font. Authors can suggest a presentation for H1 through style sheets. The heading level should be chosen based on the heading's importance and placement in the document. An H1 is typically used as the main heading for a document. All rights reserved.