test_page.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width" />
    <title>My static Space</title>
    <link rel="stylesheet" href="test_page_style.css" />
</head>

<body>
    <h1>Test Page</h1>
    <button id="btn1" class="test_button">Click Me</button>
    <div id="btn1_text" class="test_button_text_empty"></div>
    <br>
    <button id="btn2" class="test_button">Click Me Too!</button>
    <div id="btn2_text" class="test_button_text_empty"></div>

    <h2>Navigation</h2>
    <li><a href="index.html">Home</a></li>

    <script type="text/javascript" src="test_page.js"></script>
</body>

</html>