Standardizing on IDNA 2003 in the URL Standard
Shawn.Steele at microsoft.com
Tue Aug 20 18:31:02 CEST 2013
> >> I concur. We use the IDNA2008 + TR46 behavior.
>> Interesting. Last I checked Internet Explorer that was not the case.
> At this side of the keyboard, ß is still not supported in IE10/Win7-SP1
Yes, that's the + TR46 behavior.
We're not changing the spoofable entries at this time due to security concerns. You can register the ss version and it'll get there. As a complete digression, IMO IDN/DNS should allow for a "display" form mechanism because the NFKC part of the mapping is a more than a bit destructive and there're a lot of other inputs that aren't going to look like the output.
More information about the Idna-update