This is a testharness.js-based test.
[FAIL] ":is(# C4Ñ”Ð°Ð½Ð¹Ñ‚Ð¶â••/â”˜Ð“ÐÐ¶Ð®Ð¥Ñ”Ð°â–“â”ÐÐ­Ð‘ÐœÑ”Ð°Ð¡ÐµÐÐ­Ð–Ð%=[ÑÐ¼Ð¼0)" should be an invalid selector
  assert_throws_dom: ":is(# C4Ñ”Ð°Ð½Ð¹Ñ‚Ð¶â••/â”˜Ð“ÐÐ¶Ð®Ð¥Ñ”Ð°â–“â”ÐÐ­Ð‘ÐœÑ”Ð°Ð¡ÐµÐÐ­Ð–Ð%=[ÑÐ¼Ð¼0)" should throw in querySelector function "() => document.querySelector(selector)" did not throw
Harness: the test ran to completion.