Can overflow:hidden affect layout?

It is because overflow: hidden, among other properties, introduces a new block formatting context.

You can read about the effects in this great article:
The magic of overflow: hidden

UPDATE: I’ve rewritten your jsFiddle into something that is working (tested on Chrome). Instead of defining margin-left on the #red and #blue (which would act differently due to overflow: hidden), I’ve put a margin-right on #yellow.

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