HTML has six levels of headings, numbered 1 through 6, with 1 being
the most prominent. Headings appear in a larger font than normal
text. Some heading are also bolded. The general syntax for a heading
tag is:
<Hy>Heading Text</Hy>
where y is a heading numbed 1 through 6.
Examples:
<H1>This is an H1 Header</H1>
<H2>This is an H2 Header</H2>
<H3>This is an H3 Header</H3>
<H4>This is an H4 Header</H4>
<H5>This is an H5 Header</H5>
<H6>This is an H6 Header</H6>
