This is a testharness.js-based test.
[FAIL] createMediaElementSource() output reflects HTMLMediaElement effective volume changes (volume/muted)(src-stream)
  promise_test: Unhandled rejection with value: object "InvalidStateError: Failed to execute 'createMediaElementSource' on 'AudioContext': HTMLMediaElement already connected previously to a different MediaElementSourceNode."
Harness: the test ran to completion.