▶ TIMEOUT [expected ERROR] /html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/serialization-via-idb.any.worker.html
  │ 
  │ VMware, Inc.
  │ softpipe
  │ 3.3 (Core Profile) Mesa 17.3.0-devel
  │ ERROR:script::dom::bindings::error: Error at http://web-platform.test:8000/IndexedDB/support.js:8:1 add_completion_callback is not defined
  │ evaluate_script failed
  │ evaluate_script failed
  └ ERROR:script::dom::bindings::error: Error at http://web-platform.test:8000/IndexedDB/support.js:8:1 add_completion_callback is not defined