I can't say that IE is the one that bring the most problem in web designing becaue actually IE is rendering a web page better, but it just causes problems. The problem is that there are many manipulations of web page rendering in IE so that other browser that have stricter code reading such as Firefox will render it totally differently.

PS. Internet Explorer also reads margin differently than Firefox. They called the same term, with different meaning sometimes, I got annoyed because of those stuff too haha..

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