It is used to dene six levels of HTML headings (h1, h2, h3, h4, h5 and h6) with being heaviest heading and being the lightest heading.
EXAMPLE:
<h1>Heading level 1</h1> <h2>Heading level 2</h2> <h3>Heading level 3</h3> <h4>Heading level 4</h4> <h5>Heading level 5</h5> <h6>Heading level 6</h6>
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