IE is still available in 10 (As well as 7/Vista) and Edge will 'failback' (or can) to IE if compatibility gets tripped or is otherwise elected.
Still doesn't explain how/why the changes I made to the theme.js file hasn't propigated correctly or in a uniform fashion. It randomly works, currently but it still never updates the direct file view version.
There are 3 locations, HLP_20, default and core; I've modified all three. Outside of that, I haven't a clue.
is_webkit && codeFix[ i ].offsetHeight
or something)