title: XPath to find elements that does not have an id or class
body: <p>How can I get all tr elements without id attribute?</p>
  
  <pre><code>&lt;tr id="name"&gt;...&lt;/tr&gt;
  &lt;tr&gt;...&lt;/tr&gt;
  &lt;tr&gt;...&lt;/tr&gt;
  </code></pre>
  
  <p>Thanks</p>