This is a testharness.js-based test.
[FAIL] Navigator interface: operation getAutoplayPolicy(AutoplayPolicyMediaType)
  assert_own_property: interface prototype object missing non-static operation expected property "getAutoplayPolicy" missing
[FAIL] Navigator interface: operation getAutoplayPolicy(HTMLMediaElement)
  assert_own_property: interface prototype object missing non-static operation expected property "getAutoplayPolicy" missing
[FAIL] Navigator interface: operation getAutoplayPolicy(AudioContext)
  assert_own_property: interface prototype object missing non-static operation expected property "getAutoplayPolicy" missing
Harness: the test ran to completion.