This is a testharness.js-based test.
[FAIL] e.style['position-visibility'] = "anchors-valid" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "anchors-valid anchors-visible" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "anchors-valid no-overflow" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "anchors-visible anchors-valid" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "no-overflow anchors-valid" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "anchors-valid anchors-visible no-overflow" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "anchors-valid no-overflow anchors-visible" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "anchors-visible anchors-valid no-overflow" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "anchors-visible no-overflow anchors-valid" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "no-overflow anchors-valid anchors-visible" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['position-visibility'] = "no-overflow anchors-visible anchors-valid" should set the property value
  assert_not_equals: property should be set got disallowed value ""
Harness: the test ran to completion.