<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    <head>
        <title>Iframes</title>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    </head>
    <body>
        <h1>Iframes</h1>
        <iframe src="frame_1.html" id="frame_one_1" name="frame1" class="iframe"></iframe>
        <iframe src="frame_2.html" id="frame_two_2" name="frame2" class="if