title: What's the purpose of a leading colon in a jQuery selector?
body: <p>I've starting using the Wijmo toolkit, and came across quite a few example selectors similar to this in their documentation pages:</p>
  
  <pre><code>$(":input[type='radio']").wijradio();
  </code></pre>
  
  <p>I'd have written mine like this:</p>
  
  <pre><code>$('input[type=radio]').wijradio();
  </code></pre>
  
  <p>Do these do the same or is there something I'm missing?</p>
  
  <p>Note that there are two differences above: the first selector is prefixed with a colon and has quotes for the input type.</p>