How often do you really need to access the header and navigation "instantly"? In comparison, how often do you need to reread or verify information from a previous paragraph, or review a chart or graph you viewed earlier?
It's fairly obvious which one is actually more important in the majority of cases and it's going to be the actual information you're currently reading through. Obscuring the actual content in any form is a direct reduction to page usability.
It's fairly obvious which one is actually more important in the majority of cases and it's going to be the actual information you're currently reading through. Obscuring the actual content in any form is a direct reduction to page usability.