box/absolute/iframe-absolute-1.html

<!DOCTYPE HTML>
<title>Absolute positioning and iframe</title>
<style>
iframe {
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: green;
}
body {
  background-color: blue;
}
</style>
<iframe></iframe>
1	<!DOCTYPE HTML>
2	<title>Absolute positioning and iframe</title>
3	<style>
4	iframe {
5	display: block;
6	position: absolute;
7	top: 0;
8	bottom: 0;
9	left: 0;
10	right: 0;
11	background-color: green;
12	}
13	body {
14	background-color: blue;
15	}
16	</style>
17	<iframe></iframe>