Why is my CSS rendering differently in development vs. production using IE8?

Discrepancies in CSS Rendering Between Development Environment and Web Server

If you encounter differing CSS display between your development environment and web server, despite utilizing the same browser and system, the issue may stem from differing servers. In your case, you're using ASP.net Development Server in development and IIS 6.0 on the web server.

The problem may lie in the rendering differences between browsers when accessing local and web servers. Microsoft introduced distinct rendering modes for these scenarios, potentially leading to issues like those you're experiencing.

These differences arise from IE8's default behavior. Without an X-UA-Compatible value or if the site is within the Local Intranet security zone, IE8 will render it in EmulateIE7 mode.

To resolve this issue, modify your website to force full IE8 standards mode. You can do this by:

1. Incorporating an X-UA-Compatible header:

   <meta http-equiv="X-UA-Compatible" content="IE=edge">

2. Adding a META tag:

   <meta http-equiv="X-UA-Compatible" content="IE=8">

Alternatively, consult the following resource for further insights:
[IE8 Rendering Modes: Theory and Practice](http://sharovatov.wordpress.com/2009/05/18/ie8-rendering-modes-theory-and-practice/).

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