Is it feasible to adjust XHR settings in order to receive an HTML document?
xhr.responseType = "document";
Upon receiving the response, xhr.responseXML contains an HTML document parsed against the HTML namespace URI. To verify this, you can use:
xhr.responseXML.children[0].namespaceURI === 'http://www.w3.org/1999/xhtml'
Is there a way to retrieve a pure XML document response without HTML parsing, similar to:
document.implementation.createDocument(null,'');
There doesn't appear to be any official documentation addressing this specific issue, but evidence suggests that in both Firefox and Chromium browsers, the JavaScript engine interprets the xhr.responseXML differently based on the file extension of the resource being fetched:
for files with a .html extension, it treats them as HTML documents, while for files with a .xml extension, it parses them as generic XML data.
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