title: How can I get the elements without a particular attribute by jQuery
body: <p>I know how to get elements with a particular attribute:</p>
  
  <pre><code>$("#para [attr_all]")
  </code></pre>
  
  <p>But how can I get the elements WITHOUT a particular attribute?
  I try</p>
  
  <pre><code> $("#para :not([attr_all])")
  </code></pre>
  
  <p>But it doesn't work.
  What is the correct way to do this?</p>
  
  <p>Let me give an example:</p>
  
  <pre><code>&lt;div id="para"&gt;
      &lt;input name="fname" optional="1"&gt;
      &lt;input name="lname"&gt;
      &lt;input name="email"&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>jQuery:</p>
  
  <pre><code>$("#para [optional]") // give me the fname element  
  $("#para :not([optional])") //give me the fname, lname, email (fname should not appear here)  
  </code></pre>