<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<h3 style="font-size:40px;"> Some heading with font-size property.</h3>
<p style="font-size:25px;"> Some paragraph with font-size property.</p>
<a style="font-size:2em;"> Some link with font-size property.</a>
</body>
</html>