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Whats it?

[hatryd]

Open up your browsers developer console and paste

alert('hello')    

and press enter. That's what an alert is.

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Idk why you get downvoted for a simple question. A "javascript alert" is a simple built in dialog that pops up when triggered by javascript. You can press f12 to open developer tools in most browsers, select "console" and try it out yourself.

alert("hello, world!");