chromium/third_party/blink/web_tests/http/tests/misc/xhtml-expected.txt

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7

PASS: The browser asks for XHTML.