c# - IE9 is duplicating master page content -

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create brand new asp.net webforms project. add master page , webforms page uses master page.

master page

<%@ master language="c#" autoeventwireup="true" codebehind="site1.master.cs" inherits="aspweird.site1" %>  <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">  <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server">     <title></title>     <asp:contentplaceholder id="head" runat="server">     </asp:contentplaceholder> </head> <body>     <form id="form1" runat="server">     <div>         <div id="main_content_container">             <div id="main_content_row">                 <div id="main_content_column">                   <asp:contentplaceholder id="contentplaceholder1" runat="server">          </asp:contentplaceholder>                 </div>                  <div id="side_content_column">                  </div>             </div>         </div>      </div>     </form> </body> </html>

webforms page

<%@ page title="" language="c#" masterpagefile="~/site1.master" autoeventwireup="true" codebehind="webform1.aspx.cs" inherits="aspweird.webform1" %> <asp:content id="content1" contentplaceholderid="head" runat="server"> </asp:content> <asp:content id="content2" contentplaceholderid="contentplaceholder1" runat="server"> <h2>hello world</h2>  <div>     <form></form> </div>  </asp:content>

now view page in ie9 , open f12 developer tools

if see part of master page looks in dom twice...examining network capture server looks returning correct html. not have problems firefox or chrome.

screenshot http://dl.dropbox.com/u/1994980/ie9_duplicate_content.png

this happens 

<div><form></form></div>

block in there. if remove normal.

whole project zipped up

nested form tags makes invalid html , rendering see in ie9 result of that. dom see in developer tools rendered not received http response


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