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For what it may be worth, I tried to use the Tools => Validate stylesheets with W3C under Windows 11 using Firefox as the default browser.
What I get is the opening W3C page showing the no Javascript check button and then a I/O error message page.
This also happens with Microsoft Edge but Google Chrome does work.
Since I use the CSSValidator plugin, I can't say how long this behaviour has been going on.
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