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Correct Structure.

Search engines and other user agents usually index page content based on heading elements, for example to create a table of contents, so using the correct structure for headings is important.

In general, an article should have one h1 element for the main title followed by h2 subtitles – going down a layer if necessary. If there are h1 elements on a higher level they shoudn't be used to describe any lower level content.

Example document (extra intendation to illustrate hierarchy):

<h1>Main title</h1>
<p>Introduction</p>

<h2>Reasons</h2>

<h3>Reason 1</h3>
<p>Paragraph</p>

<h3>Reason 2</h3>
<p>Paragraph</p>

<h2>In conclusion</h2>
<p>Paragraph</p>

Syntax​

  • <h1>...</h1>
  • <h2>...</h2>
  • <h3>...</h3>
  • <h4>...</h4>
  • <h5>...</h5>
  • <h6>...</h6>