Hello World in HTML, CSS, JavaScript

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<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf8">
        <title>Hallo HTML Fenstertitel</title>
        <link rel="stylesheet" href="hallo.css">
        <script src="hallo.js"></script>
    </head>
    <body>
        <h1>Hallo HTML Seitentitel</h1>
        Wie geht's?
    </body>
</html>

hello.css

h1 {
    color:red;
}

hello.js

console.log("Hello world from JavaScript!");