title: jQuery support ":invalid" selector
body: <p>I get the following console message:</p>
  
  <pre><code>[16:04:01.292] Error: Syntax error, unrecognized expression: unsupported pseudo: invalid @ http://localhost:8080/assets/js/jquery-1.9.1.min.js:4
  </code></pre>
  
  <p>When I try something like:</p>
  
  <p><code>if( $(e.target).is(':invalid') ){ ... }</code></p>
  
  <p>How do I fix this?</p>
  
  <p>Here's an example: <a href="http://jsfiddle.net/L4g99/" rel="noreferrer">http://jsfiddle.net/L4g99/</a> - try changing the jQuery version (stops working after 1.9)</p>