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Reported on a spanish CSS mailing-list and forwarded to me by Fernando: «All other localized versions are displaying fine in IE. The problem is that nothing but a white screen is displayed in the browser. The source code is loaded as I can see using the View Source Code option and the browser's title bar shows the TITLE element's content: "El Servicio de Validación de CSS del W3C". But the page itself only shows a blank page.»
Looks like it's an HTML compatibility issue... the spanish page is the only one using the construct <script ... /> which IE probably doesn't like. http://qa-dev.w3.org/appc/?uri=http%3A%2F%2Fjigsaw.w3.org%2Fcss-validator%2Fvalidator.html.es
appC issues now fixed in: http://qa-dev.w3.org:8001/css-validator/validator.html.es need testing on MSIE.
tested in MSIE successfully, and propagated to the production server. closing.