The <summary> element
The part of a <details> element which is visible even when the rest of it is closed.
Usage
The <summary> element is only allowed as the first thing inside a <details> element.
It should contain phrasing content which describes what the rest of the content of the <details> element is.
The summary will be displayed by the browser whether or not the details are expanded (shown) or collapsed (hidden).
Full list of attributes
All the usual HTML global attributes are available