Submission of an <isindex> element is different compared to normal form submission with a text input element, only the value part is submitted.
This parsing definition: http://www.whatwg.org/specs/web-apps/current-work/#isindex means that <form><input name=isindex></form> also should only submit the value part. And indeed, that is what IE7 seems to be doing. Mozilla even has a bug filed for this: https://bugzilla.mozilla.org/show_bug.cgi?id=93795 So I guess this needs to be mentioned somewhere in the web forms spec or something? Regards, Martijn