title: How to autofill HTML form?
body: <p><strong>Stage</strong></p>
  
  <p>Suppose an HTML page in some URL (i.e. <a href="http://mysite.com/registry.html" rel="nofollow">http://mysite.com/registry.html</a>) and this HTML file contains a HTML form, like this:</p>
  
  <pre><code>&lt;form action="/"&gt;
    &lt;input name="firstname"&gt;
    &lt;input name="lastname"&gt;
    &lt;textarea name="message"&gt;&lt;/textarea&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>If I want to <em>prefill</em> this form how can I do this?</p>
  
  <p>Maybe I thought that I can <em>prefill</em> this form on URL request. But I do not know if it is possible.</p>
  
  <p><strong>Restriction</strong></p>
  
  <ul>
  <li>I do not have access to <code>mysite.com</code> server nor <code>registry.html</code>.</li>
  </ul>