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Are the alert and confirm functions built in to JavaScript, or are they part of the DOM?
Bonus points if you can refer me to a reference that will allow me to easily tell what functions are directly built in to JavaScript.
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One useful function that's native to JavaScript is the alert() function. This function will display text in a dialog box that pops up on the screen.
JavaScript Message Boxes: alert(), confirm(), prompt() JavaScript provides built-in global functions to display messages to users for different purposes, e.g., displaying a simple message or displaying a message and take the user's confirmation or displaying a popup to take the user's input value.
The alert() is a method of the window object.
The JavaScript alert() function is a function available on the global window object. It commands the browser to display a modal dialog with a message and an "OK" button.
These functions are usually only available in a browser environment, but they are not part of any standard , this is referred to as DOM level 0.
https://developer.mozilla.org/en/DOM/window.alert
To get a better idea of what the difference is between javascript and the DOM, read this article https://developer.mozilla.org/en/JavaScript_technologies_overview
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They are part of what is commonly referred to as DOM level 0 which isn't part of any standard.
MDN has a good JavaScript reference. It doesn't include objects that aren't part of core JS (although other sections on the site do cover DOM and other APIs).
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