javascript_inside_hidden_div.html

<!-- First, let's define a CSS class to hide things. -->
<style type="text/css">
  .hidden { display: none; }
</style>


<!-- Now let's see what happens when we execute some
  javascript within the hidden element. -->
<div class="hidden">

  I am hidden.

  <script>
    alert("I am running inside a hidden div!");
  </script>
</div>


<!-- Well? -->

Spoiler: Yes, it runs.