For more information about the document:
<summary>HTML 5</summary>This document teaches you everything you have to learn about HTML 5. </details>
Only Chrome and Safari 6 Support <summary> tag.
Title <summary> tag contains details of elements, "details" element is used to describe information about the document or document fragment.
<Summary> tag is new in HTML 5 tag.
Tip: Check with <details> tag used together. The title is visible when the user click the header will display details.
Note: "summary" element should be the first child of the "details" element.
<summary> tag supports HTML in the global properties .
<summary> tag supports HTML in the event properties .