title: Locate all xpath attributes that contains part of the value
body: <p>I need to wait for all elements to not be visible with an attribute 'id' that contains the word 'mask'.  I have tried like this:</p>
  
  <pre><code>//*[contains(@id *= 'mask')]
  </code></pre>
  
  <p>However it is giving me an element not found exception.</p>