▶ OK /html/rendering/non-replaced-elements/flow-content-0/dialog.html
  │   ▶ FAIL [expected PASS] Open dialog in width: 540px iframe
  │   │   → assert_equals: bottom expected "104px" but got "-46px"
  │   │ 
  │   │ onload/<@http://web-platform.test:8000/html/rendering/non-replaced-elements/flow-content-0/dialog.html:67:20
  │   │ Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2622:25
  │   │ test@http://web-platform.test:8000/resources/testharness.js:633:30
  └   └ onload@http://web-platform.test:8000/html/rendering/non-replaced-elements/flow-content-0/dialog.html:60:9