chromium/third_party/blink/web_tests/http/tests/xmlhttprequest/supported-xml-content-types-strange-valid-1.html

<!DOCTYPE HTML>
<script src="/js-test-resources/js-test.js"></script>
<script src="resources/supported-xml-content-types.js"></script>
<script>
description("Test identification of XML content type in XHR responses.");
window.jsTestIsAsync = true;
if (window.testRunner)
    testRunner.dumpAsText();

// They may be strange, but these should all be valid:
testXMLType("foo_bar/baz+xml", true);
testXMLType("foo-bar/baz+xml", true);
testXMLType("foo+bar/baz+xml", true);
testXMLType("foo~bar/baz+xml", true);
testXMLType("foo!bar/baz+xml", true);
testXMLType("foo$bar/baz+xml", true);
testXMLType("foo^bar/baz+xml", true);

runNextTest();
</script>