CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
ResizeObserver tests

t1
t2
 

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 
PASS test5: observe img 
PASS test6: iframe notifications 
FAIL test7: callback.this assert_equals: callback.this is ResizeObserver expected (object) object "[object ResizeObserver]" but got (undefined) undefined