The window.alert(), window.confirm(), and window.prompt() methods open modal dialogs for notifying the user, asking for confirmation, or entering text.

Learning resources on MDN

• Window: alert() method
• Window: confirm() method
• Window: prompt() method

Browser support

• Chrome 1 Released on 2008-12-11
• Chrome Android 18 Released on 2012-06-27
• Edge 12 Released on 2015-07-29
• Firefox 1 Released on 2004-11-09
• Firefox for Android 4 Released on 2011-03-29
• Safari 1 Released on 2003-06-23
• Safari on iOS 1 Released on 2007-06-29

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