Standardizing on IDNA 2003 in the URL Standard

Markus Scherer at
Wed Aug 21 21:39:10 CEST 2013

On Wed, Aug 21, 2013 at 8:01 AM, Mark Davis ☕ <mark at> wrote:

> The key migration issue is whether people are comfortable having
> implementations go to different IP addresses for IDNs containing 'ß' (or
> the other 3 related characters). The transitional form in TR46 is for those
> who are concerned with that problem. If the registries either bundled 'ss'
> with 'ß' or blocked (once either was registered the other could not), then
> the ambiguous addressing issue would not be a problem. So it is a matter of
> waiting for the significant registries to do that.

That's right. For ß vs. ss in particular, German speakers have always been
confused about exactly when to use which, and the rules changed with the
1996 reform, and Swiss users never use ß -- therefore, distinguishing them
in an otherwise case-insensitive context is just a mistake.

See also

(Apparently the original has since turned
into a redirect to the homepage for a larger administrative unit.)

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