Example 2-1. Headers with logical content contained with them
<h1>Welcome to Molly's Home Page!</h1> <h2>Books</h2> <h3>As Author</h3> <h4>Book Title</h4>
Typically, you'll want more than one subheading per sectionit helps your content to be more understandable to readers. As you can see from Figure 2-1, each level header I've used has been visually formatted to be larger at the
<h1> level and become progressively smaller.
Figure 2-1. Headers as rendered in a web browser.
Headers Are Structural, Not Visual
Display is considered discretionary to the browser manufacturer. You will use CSS to style your headers later. Headers should be used in a hierarchical fashion because the tags are describing the text being formatted.