Just tried to use different zoom steps in Safari on a non retina monitor, interesting is that with even non-integer zoom factors, the boundaries of div-box rely on physical pixels.
So the comparison between JUCE and browser engines is technically not correct.
Even if I agree that this time GUI-design should not be bounded to physical resolution, its also an aesthetic question, especially on non retina monitors.
BTW, if non-physical reliance is so important, this should be fixed
