This is a testharness.js-based test.
[FAIL] CSS Values and Units Test: attr() invalidation of pseudo elements 5
  assert_not_equals: Change of attribute value should lead to invalidation of ::placeholder element style. got disallowed value "13.3333px"
[FAIL] CSS Values and Units Test: attr() invalidation of pseudo elements 6
  assert_not_equals: Change of attribute value should lead to invalidation of ::file-selector-button element style. got disallowed value "13.3333px"
[FAIL] CSS Values and Units Test: attr() invalidation of pseudo elements 7
  assert_not_equals: Change of attribute value should lead to invalidation of ::details-content element style. got disallowed value "16px"
Harness: the test ran to completion.