Harness status: OK

Found 21 tests

10 Pass
11 Fail
Pass	ResizeObserver implemented
Pass	guard
Pass	test0: simple observation
Pass	test1: multiple observation on same element trigger only one
Pass	test2: throw exception when observing non-element
Pass	test3: disconnect stops all notifications
Pass	test4: unobserve target stops notifications, unobserve non-observed does nothing
Fail	test5: observe img
Pass	test6: iframe notifications
Pass	test7: callback.this
Fail	test8: simple content-box observation
Fail	test9: simple content-box observation but keep border-box size unchanged
Fail	test10: simple border-box observation
Fail	test11: simple observation with vertical writing mode
Fail	test12: no observation is fired after the change of writing mode when box's specified size comes from logical size properties.
Fail	test13: an observation is fired after the change of writing mode when box's specified size comes from physical size properties.
Fail	test14: observe the same target but using a different box should override the previous one
Fail	test15: an observation is fired with box dimensions 0 when element's display property is set to inline
Fail	test16: observations fire once with 0x0 size for non-replaced inline elements
Fail	test17: Box sizing snd Resize Observer notifications
Pass	test18: an observation is fired when device-pixel-content-box is being observed