EXAMPLE
Run 
<!DOCTYPE html>
<html>

<head>
	<title>The font-weight property in CSS</title>
	<style type="text/css">
		p {
		  font-weight: bolder;
		  color: green;
		}
		div {
		 font-weight: 100;
		}
		span {
		  font-weight: 800;
		}
	</style>
</head>

<body>
	<p>Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, "and what is the use of a book," thought Alice "without pictures or conversations?"</p>
	<div>I'm heavy
		<br/> <span>I'm lighter</span>
	</div>
</body>

</html>