title: HTML5 validation of image tags
body: <p>Am I not allowed to specify the unit for width and height on <code>&lt;img&gt;</code> tags in HTML5?</p>
  
  <p>I am getting this error from the validator:</p>
  
  <blockquote>
    <p>Bad value 122px for attribute width on element img: Expected a digit but saw p instead.</p>
  </blockquote>