Toolbar block element inside another problem

<div class="leftBlock">
      This is content of left block here I want to put Headline, or another block element
this will be headline
</div>

<h1 class="leftBlock">
   This is content of left block here I want to put Headline, or another block element this will be headline</h1>

<div class="leftBlock">
      This is content of left block here I want to put Headline, or another block element
<h1>this will be headline</h1>
</div>

<ol>
   <li class="leftBlock">
      This is content of left block here I want to put Headline, or another block element this will be ordered list</li>
</ol>