title: Are double forward slashes ok in URL hash fragment
body: <p>I am building the fragment string in javascript from a form and setting with window.location.hash.  If a user leaves a form input blank the resulting URL can be </p>
  
  <pre><code>example.com/#search/cars//blue//mazda
  </code></pre>
  
  <p>Note the  <code>//</code> </p>
  
  <p>If say the price was entered it would be </p>
  
  <pre><code> example.com/#search/cars/20000/blue//mazda
  </code></pre>
  
  <p>Now this works fine.  Is it bad practice?</p>