The most basic element of information structure within an HTML document is the heading.
HTML allows up to 6 levels of headings, each level defined by somewhat different display characteristics such as larger fonts for higher levels of the information hierarchy.
Although headings can be used to display different levels of hierarchy, there is nothing in the HTML headings element that actually enforces hierarchy. So you can, for example, begin a document with a Heading 3 rather than a Heading 1.
The 6 Heading elements are container elements:
| <H1></H1> | Most Important |
| <H2></H2> |
|
| <H3></H3> | |
| <H4></H4> | |
| <H5></H5> | |
| <H6></H6> | Least Important |
If you wanted to make a first-level heading of "Declaration of Independence", you'd enter:
<H1>Declaration of Independence</H1>
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