Not surprisingly, there was a lot of community feedback asking for better layout mechanisms. Actually, people were asking for any decent layout mechanism at all, which CSS has historically lacked. Floats mostly work, but they’re a hack and can be annoyingly fragile even when you ignore old-browser bugs. Positioning works in limited cases, but does not handle web-oriented layout at all well.

Why do we use floats for layout, anyway? clear. That’s pretty much the whole answer. The unique in-flow/out-of-flow nature of floats means they interact with each other and with the normal flow, which means they can be cleared, which makes them useful. Because with clear, we can float layout blocks around and then push other non-floated blocks, like footers, below the floats.

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