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>