Intermittent failure in /html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html

[jdm]

  ▶ Unexpected subtest result in /html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html:
  │ FAIL [expected PASS] img (srcset 1 cand) valid image, resize to wide
  └   → assert_unreached: Got unexpected load event Reached unreachable code

  ▶ Unexpected subtest result in /html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html:
  │ FAIL [expected PASS] picture: source (max-width:500px) valid image, img broken image, resize to wide
  └   → assert_unreached: Got unexpected load event Reached unreachable code

  ▶ Unexpected subtest result in /html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html:
  │ FAIL [expected PASS] picture: same URL in source (max-width:500px) and img, resize to wide
  └   → assert_unreached: Got unexpected load event Reached unreachable code

  ▶ Unexpected subtest result in /html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html:
  │ FAIL [expected TIMEOUT] picture: source (max-width:500px) valid image, img valid image, resize to wide
  │   → assert_equals: expected "http://web-platform.test:8000/images/green-2x2.png?101-1bde8b5c-c4d3-40a6-b808-1527b7bdba3d" but got "http://web-platform.test:8000/images/green-1x1.png?100-1bde8b5c-c4d3-40a6-b808-1527b7bdba3d"
  │ 
  │ onload/</</</img.onload<@http://web-platform.test:8000/html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html:53:13
  │ Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:1558:20
  └ Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:1598:17