title: Pre-fill form field via URL in html
body: <p>I am looking for a simple way to pre-fill a field in my contact form when ever a user clicks on a link that is given in some other page.</p>
  
  <p>This is my contact form in html :</p>
  
  <pre><code>&lt;form method="post" action="submit.php" &gt;
      &lt;p&gt;Your name:
      &lt;br /&gt;&lt;input name="name" /&gt;&lt;/p&gt;
      &lt;p&gt;Your email:
      &lt;br /&gt;&lt;input name="email" /&gt;&lt;/p&gt;
      &lt;p&gt;Your message:
      &lt;br /&gt;&lt;textarea name="message" id="message" rows="10" cols="50"&gt;&lt;/textarea&gt;&lt;/p&gt;
      &lt;p&gt;&lt;input type="submit" value="Send" /&gt;&lt;/p&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>I want to fill the "message" field with "some text" when a user clicks on a url like <code>www.xyz.com/contact.html?setmessagefield=some_text</code></p>