html - How To Add CSS3 Transition With HTML5 details/summary tag reveal?

Question

Using just CSS3, is there a way to add a nice fade-in and slide-from-left transition effect on a DETAILS/SUMMARY reveal?

For a demo of this new tag, see this demo:

details {
  transition:height 3s ease-in;
}

<details>
  <summary>Copyright 1999-2014.</summary>
  <section>
    <p> - by Refsnes Data. All Rights Reserved.</p>
    <p>All content and graphics on this web site are the property of the company Refsnes Data.</p>
  </section>
</details>

Answer 1

This should fix it.

details[open] summary ~ * {
  animation: sweep .5s ease-in-out;
}

@keyframes sweep {
  0%    {opacity: 0; margin-left: -10px}
  100%  {opacity: 1; margin-left: 0px}
}

<details>
  <summary>Copyright 1999-2014.</summary>
  <p> - by Refsnes Data. All Rights Reserved.</p>
  <p>All content and graphics on this web site are the property of the company Refsnes Data.</p>
</details>