Now sure if this will be a help for you, but in web application development if you have several divs that are using float:left; or float:right you can sometimes run into issues.
If you have a div with float:left; next to a div that has no float. The div with no float will superimpose itself on top of your div with float:left; Also it will not lineup as you expect it to with the other divs.
float:left; is used very often in web development, especially when trying to align content without the use of HTML tables.
This problem will occur regardless of the web programming language you use, whether it is ASP.NET, ColdFusion, or PHP.
Michael G. Workman