You receive an error message when you try to upload an HTML document to http://validator.w3.org

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SYMPTOMS
When you try to validate an HTML file at http://validator.w3.org/ you receive the following error message:
Sorry, I am unable to validate this document because its content type is text/plain, which is not currently supported by this service.
CAUSE
Microsoft Windows XP Service Pack 2 is installed on your computer.
RESOLUTION

Update information

To resolve this problem, install the MS05-020 security update. For more information about how to install the MS05-020 security update, click the following article number to view the article in the Microsoft Knowledge Base:
890923 MS05-020: Cumulative security update for Internet Explorer
Properties

Article ID: 890327 - Last Review: 01/16/2015 09:01:19 - Revision: 2.7

  • Microsoft Windows XP Professional SP2
  • Microsoft Windows XP Home Edition SP2
  • Microsoft Windows XP Tablet PC Edition Service Pack 2 (SP2)
  • Microsoft Windows XP Media Center Edition Service Pack 2 (SP2)
  • kbnosurvey kbarchive atdownload kbwinserv2003sp2fix kbqfe kbprb KB890327
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