Intermittent pass in /css/CSS2/floats/hit-test-floats-003.html, /css/CSS2/floats/hit-test-floats-002.html

[jdm]

  ▶ Unexpected subtest result in /css/CSS2/floats/hit-test-floats-003.html:
  │ FAIL [expected PASS] Miss float below something else
  │   → assert_equals: expected "target" but got ""
  │ 
  │ @http://web-platform.test:8000/css/CSS2/floats/hit-test-floats-003.html:13:7
  │ Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2024:25
  │ test@http://web-platform.test:8000/resources/testharness.js:548:30
  └ @http://web-platform.test:8000/css/CSS2/floats/hit-test-floats-003.html:11:3