▶ OK /html/webappapis/update-rendering/child-document-raf-order.html
  │   ▶ FAIL [expected PASS] Ordering of steps in "Update the Rendering" - child document requestAnimationFrame order
  │   │   → assert_array_equals: expected order of notifications lengths differ, expected array ["parent_raf", "first_child_raf", "second_child_raf"] length 3, got ["parent_raf", "first_child_raf", "second_child_raf", "parent_raf", "first_child_raf", "second_child_raf"] length 6
  │   │ 
  │   │ finish<@http://web-platform.test:8000/html/webappapis/update-rendering/child-document-raf-order.html:111:24
  │   │ Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2622:25
  │   │ Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2669:35
  └   └ step_timeout/<@[http://web-platform.test:8000/resources/testharness.js:123](http://web-platform.test:8000/resources/testharness.js:1234:18)