title: javascript <script> tag - code execution before src download
body: <p>In this snippet</p>
  
  <pre><code>&lt;script src="takes very long to download" type="text/javascript"&gt;
    alert('hi');
  &lt;/script&gt;
  </code></pre>
  
  <p>Lets assume that script takes a very long time to download.  Is there a chance that alert "hi" could fire before the download of script has completed? If yes, which browsers could do so?
    Note that I have placed "alert('hi')" inside the same  tag on purpose.</p>
  
  <p>Thanks</p>