prompt() and confirm() for browser users

In addition to the well known alert(), prompt() and confirm() also allow to interact with browser users.

prompt(message, defaultValue): Show a dialog to prompt the user for an information. Provide an optional default value. Return value is the string entered by the user or null. MDN window.prompt().
confirm(message): Show a dialog to provide an information to the user and wait until the user confirms or cancels. Return value is a boolean indicating if the user confirmed (true), or canceled (false). MDN window.confirm().
alert(message): Display a dialog with an optional message and wait until the user dismisses the dialog. MDN window.alert()

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