Odd IE9/7 style issue

Question

So i am completely baffled by this and hoping someone can give me some ideas to try. Not sure what details to include so let me know if i dont describe it enough and i'll add more.

We inherited a .Net MVC 4 app from a former company that already has a version on our clients production server. Recently, after a few updates from us, our client noticed that some of the menu items, styling, etc is screwed up on their test and QA servers in IE9 but works on production (Production is still from the previous companies publish). The test and QA versions also work fine in FF and Chrome

Using IETester and IE11, I tried viewing the page in IE9 mode but I did not see the same issues that my client is having, so i tried some older versions out of curiosity. I managed to reproduce the issue, but in IE7 not IE9. I had my client verify that he is in fact using IE9 and he is.

I did a compare with older versions of our _Layout.cshtml and there isnt a single thing that changed other than a favico entry. As far as i can tell, we havent changed any css or styling.

I have a webex meeting with the client tomorrow to look at his IE to see if i can find anything, but can anyone give me some ideas of what could cause this? Particularly that this page works in my IE9 but not his?

Answer 1

有时，当您将默认浏览器模式设置为ie7并将文档模式设置为ie9标准，然后再次尝试将浏览器模式更改为ie9兼容视图时，不幸的是，浏览器版本将被检测为ie7，此问题的解决方案是将浏览器模式更改为ie9而不是ie9兼容视图，则浏览器版本将被检测为ie9