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since a very short time, I suppose 2 days, I have troubles with both validatore: they ignore the first line containing the xml-declaration and behave otherwise than expected. Example: https://commons.wikimedia.org/wiki/File:SVG_Simple_Icon.svg https://validator.w3.org/check?uri=https://commons.wikimedia.org/wiki/Special:Filepath/SVG_Simple_Icon.svg&ss=1#source (Sorry! This document cannot be checked.) The NU validator checks this file: https://validator.nu/?doc=https://upload.wikimedia.org/wikipedia/commons/6/6c/SVG_Simple_Icon.svg&group=1&schema=http%3A%2F%2Fs.validator.nu%2Fsvg-xhtml5-rdf-mathml.rnc+http%3A%2F%2Fs.validator.nu%2Fhtml5%2Fassertions.sch+http%3A%2F%2Fc.validator.nu%2Fall%2F&parser=xml&showsource=1#result Other example: https://commons.wikimedia.org/wiki/File:Grosses_Landeswappen_Baden-W%C3%BCrttemberg.svg https://validator.w3.org/check?uri=https://commons.wikimedia.org/wiki/Special:Filepath/Grosses_Landeswappen_Baden-W%C3%BCrttemberg.svg&ss=1#source (Sorry! This document cannot be checked.) The NU-validator also does not show the first line https://validator.nu/?doc=https://upload.wikimedia.org/wikipedia/commons/7/79/Grosses_Landeswappen_Baden-W%C3%BCrttemberg.svg&group=1&schema=http%3A%2F%2Fs.validator.nu%2Fsvg-xhtml5-rdf-mathml.rnc+http%3A%2F%2Fs.validator.nu%2Fhtml5%2Fassertions.sch+http%3A%2F%2Fc.validator.nu%2Fall%2F&parser=xml&showsource=1#result -does not show the first line To me it is an error anyway when the validator refuses to show the source code of a file without an xml-declaration. But now with this new bug I am blocked to develop tools for the Wikipedia.
https://commons.wikimedia.org/wiki/Commons:Village_pump#W3C_validator
(In reply to W.D. Haupt from comment #1) > https://commons.wikimedia.org/wiki/Commons:Village_pump#W3C_validator https://commons.wikimedia.org/wiki/Commons:Village_pump/Archive/2018/05#W3C_validator