▶ OK /preload/link-header-preload-delay-onload.html
  │   ▶ FAIL [expected PASS] Makes sure that Link headers preload resources and block window.onload after resource discovery
  │   │   → assert_true: expected true got false
  │   │ 
  │   │ @http://web-platform.test:8000/preload/link-header-preload-delay-onload.html:33:20
  │   │ Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
  └   └ Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35