HTML5 validation does not check for much

(written by Lawrence Krubner, however indented passages are often quotes)

Sadly disappointing. This is horrible HTML that is valid under HTML5:

<!DOCTYPE html>

<head>

<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″>

<title>HTML5 Validation</title>

<link rel=”stylesheet” href=”style.css”>

<script></script>

</head>

<embed>    Text Snippet #1<br>

<p>

<p>Text Snippet #2</P>

<FOrM>

<input>

</form>

<textarea></textarea>

<a href=index.html target=”_blank”><div>& Text Snippet #3</div></a>

Source