These elements are contained in the body of the page:

<h1> Heading level 1 is the biggest and most important </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  is the smallest least important </h6>