HTML in a nutshell

<!DOCTYPE html>
<html>
<head>
<title>Hello World</title>
<style>
    .imfabulous { color: #e3e3ef; }
    #imunique { font-size: 12px; }
</style>
<script>
    // Bonus points.
    setInterval(function() {
        alert('Hello world my ἀσς!');
    }, 1000);
</script>
</head>
<body>
<!-- I'm a nasty comment -->
<h1>I'm a header. Try to change the number!</h1>
<a href="http://google.com" id="imunique" class="imfabulous">Learn HTML</a>
<img alt="My selfie" src="selfie.jpg">
<ul>
    <li>I'm an unordered list</li>
    <li>Change ul to ol to make me ordered!</li>
</ul>
<div>I'm a section block</div>
<b>I'm bold, <i>italic <u>and underlined!<span>I'm an inline span!</span></u></i></b>
<table>
    <tr><td>Row 1 Column 1</td><td>Row 1 Column 2</td></tr>
    <tr><td>Row 2 Column 1</td><td>Row 2 Column 2</td></tr>
</table>
</body>
</html>