Let's do some sticking with Javascript

Once the header is fixed, it goes out of the document normal flow. A behavior you probably know from CSS. Any element floated, positioned absoluetely or fixed looses its space and therefor create an empty hole. If you keep it that way, you will notice that the bellow content jumps up a bit. Precisely, it jumps of `b` pixels which is the height of the header. It becomes like the header element has been removed.

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