Dropped by https://gerrit.wikimedia.org/r/#/c/416723/

With T191046 (Version 18.0.0) this was fixed, but the trait must follow the naming convention of test classes (ending with Test, TestBase or TestCase) to detect properly. If that is not okay, then it needs another fix.

In case of:

{{parameter|publication_date|for example: <kbd dir="ltr">2016-11-1</kbd>}}

The second parameter has the name for example: <kbd dir and the value is "ltr">2016-11-1</kbd>
This is a parser feature and does not have todo with tidy, because the splitting is done before tidy is working. You can see this on Special:ExpandTemplates with the xml mode enabled:

This may works at the moment, because the extension is using the UnitTestsList hook

Fixed by https://gerrit.wikimedia.org/r/#/c/423953/ without changing/apply the naming convention

Should be fixed by https://gerrit.wikimedia.org/r/#/c/378382/ and https://gerrit.wikimedia.org/r/#/c/378383/ already

The change is not old, but removes the folder: https://gerrit.wikimedia.org/r/#/c/425452/

I have marked all sub tasks with "Wikimedia-log-errors (Jenkins Failure)"

Failing linter fixed with https://gerrit.wikimedia.org/r/#/c/426140/
The other issue is tracked in the other task

This test is now non-voting and removed from gate-and-submit. Please revert If7bd90e81e1e98d3b6a170fa8c9a0d6690b7eb36 when the test is fixed and should run voting on gate-and-submit. Thanks.

Patch Set exists for all remaining extensions

In T190072#4129805, @Mholloway wrote:

Doesn't fix the issue on Kartographer, either.

T190072 is closed, I have comment some days ago that the suggested version of stylelint used on AbuseFilter extension does not help, nobody response, so I have created a new one to keep it track, because it seems not a generic bug for me at time of task creation.
But with the problem also in Kartograhper it looks more generic

The linked patch set is the update of the dependencies: