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The code below comes out as valid HTML strict yet there is an error in it. The <h1> tag on compose is not closed correctly. Because of this- the form will not submit in either IE (v6) or Opera (v8.5) although Firefox does submit the form. Bad H1 code: <h1>Compose</h1 > Tom. Full source: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>Buzzplay.com - Compose Message</title> <link rel="stylesheet" type="text/css" href="http://buzzplay.thomasrix.org/style.css" > </head> <body> <div id="container"> <div id="top_banner"></div> <ul class="navlist"> <li><a href="/messaging">Messaging</a></li> <li><a href="/logout">Logout</a></li> </ul> <hr> <ul class="navlist"> <li><a href="/compose-message">New</a></li> <li><a href="/view-inbox">Inbox</a></li> <li><a href="/view-sent">Sent</a></li> </ul> <div id="contain_sides"> <div id="content"> <h1>Compose</h1 ><form action="http://buzzplay.thomasrix.org/send-message" method="post"> <p><label for="to">To</label><br><input id="to" type="text" value="" name="to" size="20"></p> <p><label for="subject">Subject</label><br><input id="subject" type="text" name="subject" size="20"></p> <p><label for="msg">Message</label><br><textarea id="msg" rows="25" cols="60" name="message"></textarea></p> <p><input id="submit_button" type="submit" value="Send Message"></p> </form> </div> <br><br> </div></div> <div style="text-align:center; font-size:14px; color:#000000; font-variant:small-caps;">Powered by BuzzPlatform<sub>beta</sub></div> </body> </html>
This actually perfectly valid HTML, but regrettably a part of the standard that common browsers have problems with.