I am not sure of the reasons but that is the normal
appearance in Safari, at least it is what I have seen. I think the
issue is how Safari handles things rather than what RoboHelp
produces.
In looking at other help products before going for RoboHelp,
did you download some trial versions of other products and have you
checked their output in Safari?
Maybe someone with more knowledge of Safari can comment?
For what it may be worth, only 1.3% of the visitors to my
site use Safari so that wouldn't upset me too much. Of course the
percentage may be different and more important for you. I suspect
Safari users are used to such things.
Right or wrong, IE and Firefox are the biggies.
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