It is not a problem with the XML. The fact that Chrome and Edge do not render the Define-XML file is because of security issues. No modern browser allows the rendition of XML by applying an XSL file within the browser. Internet Explorer was the only browser that still allowed it. But, as you mention, IE has long been abandoned by Microsoft, and soon will be end-of-life. You can use PROC XSL in SAS to create an HTML file from the XML and the stylesheet that can be opened by any browser. PROC XSL can be limited, so here is another solution to create HTML: https://swhume.github.io/blog-2022-generate-html-from-xml.html
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