Intermittent FAIL in /html/dom/dynamic-markup-insertion/document-write/iframe_005.html

[wafflespeanut]

  ▶ Unexpected subtest result in /html/dom/dynamic-markup-insertion/document-write/iframe_005.html:
  │ FAIL [expected PASS] document.write external script into iframe write back into parent
  │   → assert_array_equals: lengths differ, expected 5 got 2
  │ 
  │ @http://web-platform.test:8000/html/dom/dynamic-markup-insertion/document-write/iframe_005.html:20:7
  │ Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:1406:20
  └ @http://web-platform.test:8000/html/dom/dynamic-markup-insertion/document-write/iframe_005.html:19:5

[jdm]

cc @nox

[nox]

We don't handle delaying the load event for iframes correctly.

[nox]

This is quite weird. I don't understand how the load event handler can see only 2 items in order, given everything happens sequentially in that test.

[nox]

@jdm I can't reproduce it if I run only that test, and I can't log to a file the complete logs without color escape sequences when I reproduce it by running all the document-write tests through ./mach test-wpt. What is the magical test-wpt command to have a log file that is actually useful and human-readable?

[jdm]

I haven't encountered that problem before. You're blazing new trails!

[nox]

I managed to log without the weird escape sequences, but now I have another problem. How can I use RUST_LOG with some debug levels in a release build? I have 0% reproducibility with debug.