<body>
<h1 style="color:red;font-size:40px;">Heading</h1>
<p style="color:blue;font-size:18px;">This is demo text</p>
</body><span style="font-size:20px;"></span><!DOCTYPE html>
<html>
<head>
<title>HTMLFont size</title>
</head>
<body>
<h1 style="color:red;font-size:40px;">Heading</h1>
<p style="color:blue;font-size:18px;">This is demo text</p>
</body>
</html>font-size:20px;
"default size is : +-16px;" <font size="+2">This is bigger text.</font>font-size: 25px;