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Represent headings and subheadings. These elements rank in importance according to the number in their name. The h1 element is said to have the highest rank, the h6 element has the lowest rank, and two elements with the same name have equal rank.

<!-- 
 The H1 element applies a
 level-1 heading syle to the
 contained text. 
-->
<h1>Welcome to Web Platform Docs!</h1>
<!-- 
 H2 is used for level-2 headings.
 -->
<h2>Introduction</h2>
<!-- etc. -->
<h3>Prologue</h2>
<h4>Level-4 Heading</h4>
<h5>Level-5 Heading</h5>
<h6>Level-6 heading smallest heading avaliable</h6>

Welcome to Web Platform Docs!

Introduction

Prologue

Level-4 Heading

Level-5 Heading
Level-6 heading smallest heading avaliable
Read more on w3.org