The H1, H2, H3, H4, H5, and H6 elements defines headings.
<h1>heading</h1>
There are six levels in headings : from <h1> (Largest header) to <h6> (Smallest header)
The font size can be changed with CSS.
How to use headings
Do not include the block-level element to the content of this element.
<h1>Primary heading</h1> <p>Paragraph text</p> <h2>Secondary heading</h2> <p>Paragraph text</p> <h3>Third-level heading</h3> <p>Paragraph text</p>
Paragraph text
Paragraph text
Paragraph text
Example of heading image
<h1><img src="heading.gif" alt="Primary heading"></h1>
<p>Paragraph text</p>

Paragraph text