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William Hurst24,437 Points
Where is the explicit value for the header element?
Nick states states that when float is added to the header, it no longer has a explicit value. Not sure if I have looked past it, but I can't see an explicit value for the header. Any help thanks.
Steven Parker225,742 Points
I think what he means is that being a block element, by default it gets the full width of it's container. It's not actually "explicit" in the sense of having a width property in a CSS rule.
Floating causes it to loose this "explicit width" and allow other elements to flow around it.
Tom Checkley25,165 Points
A floated element doesn't have a an explicit width, so he sets the width of the header to 100% to make it stretch the full width of the screen. Otherwise it would only take up as much space as the elements inside it required.