title: Can't find an element by "querySelector"
body: <p>This request:</p>
  
  <pre><code>someTag.querySelector("tbody &gt; tr[my-attr='333']").children
  </code></pre>
  
  <p>returns an array of "td". Some of them have an attribute "attribute1". How can I find a "td" among which has the attribute1="123"?</p>
  
  <p>I've tried different approaches but hasn't been successfull. For example:</p>
  
  <pre><code>someTag.querySelector("tbody &gt; tr[my-attr='333'][attribute1='123']")
  </code></pre>
  
  <p>returns null</p>