title: Closing a pure html/css modal dialog causes a new history entry
body: <p>I am using</p>
  
  <pre><code>http://domain.com/page1.htm#modal
  </code></pre>
  
  <p>to open a modal dialog using css and the :target pseudo selector.</p>
  
  <p>Problem comes when I close that using <code>&lt;a href&gt;close&lt;/a&gt;</code>.  This closes the modal window correctly but also adds a new history entry.  So history now looks like:</p>
  
  <pre><code>http://domain.com/page1.htm
  http://domain.com/page1.htm#modal
  http://domain.com/page1.htm
  </code></pre>
  
  <p>Is there some way of preventing the action tag from creating this new history entry?</p>