Window.confirm

Boolean confirm (String message, Boolean noAsDefault, String title)

Parameters

message	The string for the displayed message.
noAsDefault	When true, the No button is the default choice, selected when the user types Enter.
title	A string to appear as the title of the dialog, if the platform supports a title.

Description

Displays a platform-standard dialog containing a short message and two buttons labeled Yes and No.

Returns true if the user clicked Yes, false if the user clicked No.