iframe.html:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<a href="http://www.baidu.com" target="content">Baidu</a>
<iframe width="800px" height="600px" name="content" frameborder="no"></iframe>
</body>
</html>