This is a testharness.js-based test.
[FAIL] Keyboard interface: attribute onlayoutchange
  assert_true: The prototype object must have a property "onlayoutchange" expected true got false
[FAIL] Keyboard interface: navigator.keyboard must inherit property "onlayoutchange" with the proper type
  assert_inherits: property "onlayoutchange" not found in prototype chain
Harness: the test ran to completion.