<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<p>The formula of water is H<sub>2</sub>O, and the formula of alcohol is C<sub>2</sub>H<sub>5</sub>ОН </p>
<p>E = mc<sup>2</sup>, where E — kinetic energy, m — mass, c — the speed of light. </p>
</body>
</html>