Harness status: Error

Test named 'exception-thrown-diameter-less-than-or-equal-to-0' specified 1 'cleanup' function, and 1 failed.

Error: action_sequence() is not implemented by testdriver-vendor.js
    at Object.action_sequence (https://www1.wpt.live/resources/testdriver.js:1678:19)
    at Object.action_sequence (https://www1.wpt.live/resources/testdriver.js:721:48)
    at Actions.send (https://www1.wpt.live/resources/testdriver-actions.js:99:26)
    at Test.<anonymous> (https://www1.wpt.live/delegated-ink/exception-thrown-diameter-less-than-or-equal-to-0.tentative.html:22:81)