HTML headings are defined with the <h1> to <h6> tags.
<h1> ---------- >>>> defines the most important heading.
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<h6> ---------- >>>> defines the least important heading.
<h1> ---------- >>>> defines the most important heading.
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<h6> ---------- >>>> defines the least important heading.
Example
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
<h4>This is heading 4</h4>
<h5>This is heading 5</h5>
<h6>This is heading 6</h6>
Output
<h5>This is heading 5</h5>
<h6>This is heading 6</h6>
Output