What is the issue with the HTML Standard?
Step 2 of #abort-a-navigateevent signals an abort on the event's abort controller. This is called as part of the failure steps called from #inner-navigate-event-firing. However, when implementing this, the following tests fail, because the abort signal is not listed.
Gecko's old (pre-precommithandler) implementation passed these tests, so I assume that there were refactorings and the tests need to be updated.
cc @noamr