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JavaScript simple alert on Click

When the user clicks on the button, the onclick event has been fired and the JavaScript message listed in the value of the attribute are executed.

Example

onClick Demo 
<!DOCTYPE html>
<html>
<head>
    <title>onClick Demo</title>
</head>
<body>
    <input type="button" onclick="alert('You clicked the button!')" value="Click Me" />
</body>
</html>
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