This is a testharness.js-based test.
[FAIL] RemotePlayback interface: existence and properties of interface object
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface object length
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface object name
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: existence and properties of interface prototype object
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: existence and properties of interface prototype object's "constructor" property
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: existence and properties of interface prototype object's @@unscopables property
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: operation watchAvailability(RemotePlaybackAvailabilityCallback)
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: operation cancelWatchAvailability(optional long)
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: attribute state
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: attribute onconnecting
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: attribute onconnect
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: attribute ondisconnect
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback interface: operation prompt()
  assert_own_property: self does not have own property "RemotePlayback" expected property "RemotePlayback" missing
[FAIL] RemotePlayback must be primary interface of media.remote
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] Stringification of media.remote
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] RemotePlayback interface: media.remote must inherit property "watchAvailability(RemotePlaybackAvailabilityCallback)" with the proper type
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] RemotePlayback interface: calling watchAvailability(RemotePlaybackAvailabilityCallback) on media.remote with too few arguments must throw TypeError
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] RemotePlayback interface: media.remote must inherit property "cancelWatchAvailability(optional long)" with the proper type
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] RemotePlayback interface: calling cancelWatchAvailability(optional long) on media.remote with too few arguments must throw TypeError
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] RemotePlayback interface: media.remote must inherit property "state" with the proper type
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] RemotePlayback interface: media.remote must inherit property "onconnecting" with the proper type
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] RemotePlayback interface: media.remote must inherit property "onconnect" with the proper type
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] RemotePlayback interface: media.remote must inherit property "ondisconnect" with the proper type
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] RemotePlayback interface: media.remote must inherit property "prompt()" with the proper type
  assert_equals: wrong typeof object expected "object" but got "undefined"
[FAIL] HTMLMediaElement interface: attribute remote
  assert_true: The prototype object must have a property "remote" expected true got false
[FAIL] HTMLMediaElement interface: attribute disableRemotePlayback
  assert_true: The prototype object must have a property "disableRemotePlayback" expected true got false
Harness: the test ran to completion.