(In reply to This, that and the other (TTO) from comment #2)
Does not occur in IE11. Has an official decision been made on whether to
support IE <= 10?
The ambition is to support IE9 and up; IE10 doesn't add much compared to IE9, but is probably a necessary stepping-stone. If it turns out to be too much work, we'll abandon efforts, but for now, yes, this is on the worklist.