Standardizing on IDNA 2003 in the URL Standard

Anne van Kesteren annevk at
Thu Aug 22 14:17:58 CEST 2013

On Thu, Aug 22, 2013 at 12:38 PM, Mark Davis ☕ <mark at> wrote:
> There are three major options for clients:
> 1 Move immediately to IDNA2008.
> 2 Stay on IDNA2003.
> 3 Move to TR46+IDNA2008 as a transition to IDNA2008.
> Recent history has shown that the major clients are reluctant to do #1
> because of compatibility concerns. I don't think anyone really wants #2,
> because it has an archaic Unicode version, but people are sticking with that
> if they see #1 as the only other choice.
> That effectively leaves #3. And certainly major players like IE have shown
> that it can be deployed effectively.

2 as deployed is not stuck on an archaic Unicode version. 3 might be
interesting, depending on what variant is chosen. E.g. Gerv has been
suggesting that we in Gecko should implement a different variety from
Internet Explorer... (I'm not a fan.)

Overall though I feel compatibility is downplayed way too much. It's
very bad to break deployed content.


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