Intermittent failure in /html/browsers/browsing-the-web/navigating-across-documents/009.html, /html/browsers/browsing-the-web/navigating-across-documents/008.html

[jdm]

{
    "status": "FAIL", 
    "group": "default", 
    "message": "assert_array_equals: property 1, expected \"href\" but got \"click\"", 
    "stack": "onmessage<@http://web-platform.test:8000/html/browsers/browsing-the-web/navigating-across-documents/009.html:18:7\nTest.prototype.step@http://web-platform.test:8000/resources/testharness.js:1908:25\nTest.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:1932:35\n", 
    "subtest": "Link with onclick form submit to javascript url with document.write and href navigation ", 
    "test": "/html/browsers/browsing-the-web/navigating-across-documents/009.html", 
    "line": 272643, 
    "action": "test_result", 
    "expected": "PASS"
}

[SimonSapin]

https://community-tc.services.mozilla.com/tasks/d6B_pmOSQXmkmBmwTP-Yrw/runs/0/logs/https%3A%2F%2Fcommunity-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2Fd6B_pmOSQXmkmBmwTP-Yrw%2Fruns%2F0%2Fartifacts%2Fpublic%2Flogs%2Flive.log#L1434-1442 looks similar:

  ▶ Unexpected subtest result in /html/browsers/browsing-the-web/navigating-across-documents/008.html:
  │ FAIL [expected PASS] Link with onclick form submit to javascript url and href navigation 
  │   → assert_equals: expected "href" but got "click"
  │ 
  │ onmessage<@http://web-platform.test:8000/html/browsers/browsing-the-web/navigating-across-documents/008.html:14:5
  │ Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:1984:25
  └ Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2009:35