title: What does "Failed parsing 'srcset' attribute value since its 'w' descriptor is invalid." mean?
body: <p>I get Chrome errors on my website that say:</p>
  
  <blockquote>
    <p>Failed parsing 'srcset' attribute value since its 'w' descriptor is
    invalid.<br>Dropped srcset candidate
    <a href="http://i2.wp.com/domain.net/wp-content/.../image.jpg?resize=425%2C200" rel="noreferrer">http://i2.wp.com/domain.net/wp-content/.../image.jpg?resize=425%2C200</a></p>
  </blockquote>
  
  <p>Any idea what this means?</p>
  
  <p>I am using WordPress as my website platform. I also use its Photon feature (within its Jetpack framework). My suspicion is that it has to do with this feature. Are image dimensions getting specified incorrectly or something? </p>
  
  <p>What are 'w' descriptors?</p>
  
  <hr>
  
  <p><strong>UPDATE</strong>:
  Here is the HTML:</p>
  
  <pre><code>&lt;img src="http://i1.wp.com/gaithersburgpsychologist.net/wp-content/uploads/2015/02/lightbulb.jpg?resize=425%2C200"
     srcset="http://i1.wp.com/gaithersburgpsychologist.net/wp-content/uploads/2015/02/lightbulb.jpg?resize=425%2C200 w, http://i1.wp.com/gaithersburgpsychologist.net/wp-content/uploads/2015/02/lightbulb.jpg?resize=450%2C320 w"
     sizes="(min-width: 768px) 720px, (min-width: 992px) 700px, (min-width: 1200px) 850px, calc(100vw-20px)"
     alt="Change your thoughts and you change your world."&gt;
  </code></pre>