title: -webkit-baseline-middle and -moz-middle-with-baseline
body: <p>When using browsers web inspectors I came across two different and non-standard property for the CSS attribute <code>vertical-align</code>.</p>
  
  <p><code>-webkit-baseline-middle</code> is only available in Chrome while <code>-moz-middle-with-baseline</code> is available on Firefox. The naming is similar but NOT the same.</p>
  
  <p>I couldn't find any information regarding these two on the web. They are not even listed on <a href="https://developer.mozilla.org/en/docs/Web/CSS/vertical-align" rel="noreferrer">MDN</a>.</p>
  
  <p>My questions: </p>
  
  <ul>
  <li>Are they part of any standards?</li>
  <li>What is the expected behavior when
  using them?</li>
  </ul>