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As http://xsltransform.net/ never got updated to newer Saxon versions and especially Saxon 9.8 (the first Saxon version to support the XSLT 3 spec finalized in June 2017) I have set up https://xsltfiddle.liberty-development.net/ which uses the .NET version of Saxon 9.8 HE to allow testing and sharing XSLT 3 samples.
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