Hype uses absolute positioning for all its layers/elements/groups (DIV’s under the hood). So read about what this means and what other positioning alternatives there…
Like fixed, relative and specially the new native sticky
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I was actually thinking about this issue recently. I'm considering adding an entire website template and related chapter to the new book. That's when I was wondering how to manage the menu. Should I use the "sticky" style, or should I use viewport actions.
...hmmm... do I really care enough about IE 11 support?! 
Maybe I should just stop supporting it. Because, apparently, it's an "immortal" web browser.