HTML5: details – control for additional on-demand information (NEW)

details – control for additional on-demand information ⓘ NEW # T

The details element represents a control from which the user can obtain additional information or controls on-demand.

an optional summary element, followed by flow content

open = "open" or "" (empty string) or empty: Specifies that the contents of the details element should be shown to the user.

The interactive element details must not appear as a descendant of the a element.
The interactive element details must not appear as a descendant of the button element.

A details element must have both a start tag and an end tag.

any element that can contain flow elements

interface HTMLDetailsElement : HTMLElement {
           attribute boolean open;
};