level3_composed.html

<div id="level3">
<div id="level2">
<div id="level1">
    
<button id="process-button"  type="submit" class="btn">
  
<p>level3 here</p>

</button>

	<hr>
    
<span>
  
<h3>This comes from level3</h3>

</span>
    
</div>

</div>

</div>