This question already has an answer here:

I am fairly new to website design. I am currently coding a new site. I have a local server setup (localhost) using Apache and testing using Firefox Ver 21 and IE Ver 9. I am getting display differences between Firefox and IE. I am confused about IE compatibility mode. For my testing should IE compatibility mode in IE be set on (checked I suppose) or off (unchecked)? Any other suggestions on how to ensure the displays will be correct on different versions of IE? If I get the display like I want it in Firefox, some aspect is different in IE with compatibility off. If I turn compatibility on it might fix one issue but screw up another. I guess I just don't understand the correct process to attack the compatibility issues between browsers, if that makes any sense. Doing all the layout in CSS.

marked as duplicate by Simon Hayter Jun 14 '13 at 18:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.