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Bug 5225 - Support for Internationalised Domain Names
Summary: Support for Internationalised Domain Names
Status: NEW
Alias: None
Product: Validator
Classification: Unclassified
Component: check (show other bugs)
Version: HEAD
Hardware: PC All
: P2 normal
Target Milestone: ---
Assignee: This bug has no owner yet - up for the taking
QA Contact: qa-dev tracking
: 7162 (view as bug list)
Depends on:
Reported: 2007-10-24 17:24 UTC by Alexandre Alapetite
Modified: 2009-08-17 12:40 UTC (History)
3 users (show)

See Also:


Description Alexandre Alapetite 2007-10-24 17:24:04 UTC
Copy from

The W3C Markup Validation Service apparently does not accept
Internationalised Domain Names in its URL field.

It returns an error 500 "Bad hostname" and a message "Sorry! This
document can not be checked".

Currently, the validator transforms the domain part of an URL in
Unicode UTF-8, while the correct transformation of the domain is in
punycode (RFC 3492).

You can find some examples of such Internationalised DNS here:
(My test was with some French characters with accents such as 'é' in a

Another reference of interest:
"An Introduction to Multilingual Web Addresses"

All modern browsers I tested (Opera, Mozilla, Mozilla Firefox,
Internet Explorer, etc.) support this in their current version.

All the best,
Comment 1 Yves Lafon 2009-08-17 12:40:19 UTC
*** Bug 7162 has been marked as a duplicate of this bug. ***