HTML version choice

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8"/>
        <title></title>
    </head>
    <body>
        <p>Line1<br/>Line2</p>
        <p><img src="" alt="blank"/></p>
        <p><input type="text"/></p>
        <p><embed type="application/x-something" src=""/></p>
    </body>
</html>