Why Does My CSS Render Differently in Development and Production Environments?

CSS Discrepancies Between Development and Web Server Environments

In this scenario, a user is facing inconsistent CSS rendering between their development environment and a live web server. Despite using the same browser and machine, certain elements display differently under different "server" settings, specifically ASP.net Development Server and IIS 6.0.

Specific Discrepancies Observed:

• Collapsible panel control slides behind other elements on the web server instead of overlaying them (as it does in the development environment).
• Text element displays on multiple lines on the web server, even though the text size remains the same.
• Button width varies between the two environments, with buttons wider on the web server.

Cause and Solution:

The probable cause of these discrepancies stems from Microsoft's introduction of different rendering modes for local and Internet servers in Internet Explorer 8. To maintain compatibility with Internet Explorer 7, Microsoft introduced the EmulateIE7 mode for local websites. This mode can lead to inconsistencies when websites are deployed to a live server, which operates in full IE8 standards mode.

To resolve this issue, it is recommended to force full IE8 standards mode by adding an X-UA-Compatible header or META tag to the page. This will ensure consistent rendering across different environments.

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