title: Explanation and example of aria-owns, aria-invalid, aria-expanded
body: <p>I was looking at some code and one of the tags had the attributes <code>aria-owns</code>, and <code>aria-expanded</code>. I googled them and didn't find enough detail to fully understand what they do. </p>
  
  <p>Could someone explain the use of these specific attributes? I have a general understanding of what the aria attributes do (I have used <code>aria-labelledby</code>)?</p>