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Java Script Hello World

The following script will display 'Hello World' both in a popup window and in the browser's console. To execute the script, it must be run within a web browser.

You can view the console output by accessing the browser's developer tools.

hello-world-js.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello World!</title>
</head>
<body>
    <h1>Hello World! from JS in a script tag</h1>
    <script>
        alert('Hello world!');
        const h1 = document.querySelector('h1');
        console.log(h1.textContent);
    </script>
</body>
</html>