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2 reasons behind this feature:
I dropped in a flexible helper function, but it could be simplified. If @Pseudonian wants to put it directly in format, we can just have the fractional code output .innerHTML code. Then for the few elements that use fractional code, calling DOM('element').innerHTML = format(sometimes fractional number) will work fine when the number is big or small. I'll push this idea as a separate commit, because simpler might be better.
The more complicated change could avoid innerHTML use by showing/hiding a fractional container and setting the numerator and denominator as .textContent. I don't think this is necessary, I'm not sure.