1<!DOCTYPE html>
2<style>
3 div#div1 {
4 background: blue;
5 width: 200px;
6 height: 200px;
7 }
8 div#div2 {
9 background: red;
10 width: 2000px;
11 height: 2000px;
12 }
13</style>
14<body>
15 <div id="div1">will go fullscreen</div>
16 <div id="div2">will not go fullscreen</div>
17</body>
18