Internet Explorer provides a way to target CSS styling information specifically for its different versions. These “conditional stylesheets” are the best way to handle CSS problems that pop up with your page in IE. They aren’t “hacks” (which are liable to cause problems with new browsers down the road), they are perfectly valid code. Just be careful not to overdo it and make things more complicated for yourself.
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Thank you! Your video really helped me to understand more about IE problems.