This is a testharness.js-based test.
[FAIL] UncalibratedMagnetometer: unfocused sensors in cross-origin frames are not updated
  assert_implements: UncalibratedMagnetometer is not supported. undefined
[FAIL] UncalibratedMagnetometer: sensors in same-origin frames are updated if one of the frames is focused
  assert_implements: UncalibratedMagnetometer is not supported. undefined
[FAIL] UncalibratedMagnetometer: losing a document's frame with an active sensor does not crash
  assert_implements: UncalibratedMagnetometer is not supported. undefined
[FAIL] UncalibratedMagnetometer: calling start() in a non-fully active document does not crash
  assert_implements: UncalibratedMagnetometer is not supported. undefined
Harness: the test ran to completion.