<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<style>
html, body, div, iframe {margin:0;padding:0;height:100%;}
iframe {display:block;width:100%;border:none;}
</style>
</head>
<body>
<div><iframe src="http://yandex.ru"></iframe>
</div>
</body>
</html><!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<style>
html, body, div, iframe {margin:0;padding:0;height:100%;}
iframe {display:block;width:100%;border:none;}
</style>
</head>
<body>
<div><iframe src="http://yandex.ru"></iframe>
</div>
</body>
</html>