Loading speed, web and servers
popover
In short and in plain language
A popover is a layer that sits on top of the page.
It can be a menu or a notice. New browsers can open and close such a layer without extra script.
The rest of the page stays usable.
Definition
A popover is a layer that sits on top of the page, such as a menu, a notice or a filter panel. Current browsers offer a dedicated HTML attribute that opens and closes such layers without custom JavaScript. Unlike a modal dialog, a popover leaves the rest of the page usable.