Well, I ran the test code for bililiteRange and got "132 assertions of 151 passed, 19 failed." Better than none passed, I suppose, but it means I've got some work ahead of me. Or I could just give up on IE, but IE11 is supposed to be standards-compliant, so the errors might actually reflect a problem.
Some of the results are weird: the expected and actual results look identical, so I imagine there's some '\r'
s rearing their ugly heads, even in IE11. The selection is not being retained on losing focus in input elements; that might be a real problem. And then some tests are failing with a "WrongDocumentError". Never seen that before.
I'll add this to my list of things to get to eventually.