default font size in html h3 code example
Example 1: how to change font size in html
<body>
<h1 style="color:red;font-size:40px;">Heading</h1>
<p style="color:blue;font-size:18px;">This is demo text</p>
</body>
Example 2: change font size of h1 in html
<style>
h1 {
font-size: 100px;
}
</style>