title: With twig how to store a variable inside html code
body: <p>Is there an equivalent to this in Twig :</p>
  
  <pre><code>&lt;?php
     $a = 'hello';
     $b = '&lt;h1&gt;'.$a.'&lt;/h1&gt;';
  
     echo $b;
  ?&gt;
  </code></pre>
  
  <p>I try this but without success :</p>
  
  <pre><code>{% set a = 'hello' %}
  {% set b = &lt;h1&gt;{{a}}&lt;/h1&gt; %}
  </code></pre>
  
  <p>I'm new to twig and couldn't find a way to do this.</p>