JavaScript is a programming language of HTML and the web.
HTML to define the content of web pages
CSS to specify the layout of web pages
JavaScript to program the behavior of web pages
<!DOCTYPE html>
<html>
<body>
<h2>Hello JavaScript</h2>
<button
type="button"
onclick="document.getElementById('dateLabel').innerHTML = Date()"
>
Click me to display Date and Time.
</button>
<p id="dateLabel"></p>
</body>
</html>
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