This is a testharness.js-based test.
[FAIL] Modifying the reference target changes .labels when using label/for
  assert_array_equals: input1 after changing reference target lengths differ, expected array [] length 0, got [Element node <label id="label-input6" for="x-input6-outer">Input 6</la...] length 1
[FAIL] Attaching a shadow root, inserting and removing a shadow host, and changing reference targets all cause label association to be updated
  assert_array_equals: after inserting light input in container lengths differ, expected array [Element node <label id="outer-label8" for="outer-input8"></label>] length 1, got [] length 0
Harness: the test ran to completion.