A simple modal with an optional title and some content. Modals are opened by clicking on a modal handle, which is a button that triggers the modal to open. The content of the modal can be anything, but it's usually some form of text or a form.
Modal and its handle are connected by a unique id. When the
handle is clicked, the modal with the corresponding id is
opened. To guarantee that id is unique and there are no
conflicts when multiple modals are used on the same page, use
ui.util.id() function to generate it.