I've seen two different types of navigation bars when a site requires nested navigation, one where hovering over a link drops down an additional menu, and one where a second horizontal bar is populated with the links in this category. In what situations should I prefer one over the other? It seems like drop down navigation is the most common, but are there situations where having the two horizontal columns would work out better?
Answer
There is a issue of the number of links you need to access. Dropdowns can give access to many more links.
There is the vertical space issue. Floating dropdowns save you some space.
And there is the ease of use issue. I tend to think that if your website has distinct sections, e.g., faq, tour and support, and each one of these sections has a few sub-sections - using the 2 row navigation may be easier because then the user has a one-click-access to the other sub-sections.
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