aria-haspopup attribute

This attribute indicates the availability and type of interactive popup element, such as menu or dialog.

Aria 1.0 values are well supported, such as true, false, and menu (which is the same as true). New values such as dialog, grid, listbox, and tree are not supported. This lack of support might cause significant issues for screen reader users. For example, aria-haspopup="listbox" being announced as aria-haspopup="menu" could lead users to think that something the behaves like a native <select> (listbox) is a menu.