Markup Validation Service

Check the markup (HTML, XHTML, …) of Web documents

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Sorry! This document cannot be checked.

1. 

   I got the following unexpected response when trying to retrieve <http://qa-dev.w3.org/wmvs/HEAD/dev/tests/2329-html401-transitional_iframe.html>:

   500 Can't connect to qa-dev.w3.org:80

   If you made recent changes to your domain name (DNS) configuration, you may also want to check that your domain records are correct, or ask your hosting company to do so.

This service runs the W3C Markup Validator, v1.3+hg.

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