


Why Does My CSS Render Differently in Local and Server Environments?
CSS Rendering Discrepancies Between Local and Server Environments
When migrating a web application from a development environment to a web server, CSS rendering issues can arise despite using the same browser and machine. Specifically, differences have been observed in collapsible panels, div sizes, and button widths.
Causes
The root cause of this behavior lies in the different rendering modes implemented by Microsoft Internet Explorer 8. Local and Internet servers trigger distinct modes, leading to discrepancies in CSS interpretation.
In the absence of an X-UA-Compatible value and if the site resides within the Local Intranet security zone, Internet Explorer 8 defaults to EmulateIE7 mode.
Solution
To resolve this issue, developers can force Internet Explorer 8 to run in full standards mode by adding an X-UA-Compatible header or META tag to their websites. This will ensure consistent CSS rendering regardless of the server environment.
Additional Resources
For further insights into this topic, consult the following resource:
- [IE8 Rendering Modes: Theory and Practice](http://sharovatov.wordpress.com/2009/05/18/ie8-rendering-modes-theory-and-practice/)
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