Try it Editor: html5

Edit This Code :



<!DOCTYPE html>
<html>
<body>

<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>

<p><b>Note:</b> The summary element is not supported in Edge/Internet Explorer.</p>

</body>
</html>

Result :

html5_summary