<h1>...</h1>
HTML defines six levels of heading. A Heading element implies all the font
changes, paragraph breaks before and after, and white space necessary to render
the heading.
The highest level of headings is <h1>, followed by <h2>, <h3>, etc. to <h6>.
<h1> is rendered using the largest font, with the subsequent heading levels
being continuously smaller.
Attributes
ALIGN
The ALIGN attribute may be used to align headings. The value of this attribute may be left, right, or center.