XMLHttpRequest.responseXML.characterSet may be inaccurate. We always return UTF-8, no matter which encoding we used for decoding the bytes.
Pull request: https://github.com/WebKit/WebKit/pull/15011
Committed 265210@main (64cb5c7438da): <https://commits.webkit.org/265210@main> Reviewed commits have been landed. Closing PR #15011 and removing active labels.
<rdar://problem/110863647>