[phillipgessert]

Well, it's kinda semantics (badum-tish) but I think by saying you knew you could click because it was a hypertext doc you probably basically meant that you knew you could interact/navigate because you were within a system that allowed for that, right? My point just being not everyone will know that. Jellby's point above is sound in general, but e.g. my preferred device has no touch at all, and I could see a less savvy user being less inclined to think "I can swipe therefore I can tap" on a device that allows neither. In any case personally I'm pretty firmly in the underlines camp so naturally I'm a little biased.