colors.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Colors</title>
    <script>
        document.addEventListener('DOMContentLoaded', () => {
            document.querySelector("select").onchange = function() {
                document.querySelector("#hello").style.color = this.value;
             };
        });
    </script>
</head>
<body>
    <h1 id="hello">Hello!</h1>
    <select name="color">
        <option value="black">Black</option>
        <option value="red">Red</option>
        <option value="blue">Blue</option>
        <option value="green">Green</option>
        <option value="gold">Gold</option>
        <option value="yellow">Yellow</option>
        <option value="orange">Orange</option>
    </select>
</body>
</html>