This is a testharness.js-based test.
FAIL Test copied keyframeEffectReadOnly has the same target Failed to construct 'KeyframeEffectReadOnly': 2 arguments required, but only 1 present.
FAIL Test copied keyframeEffectReadOnly has the same keyframes Failed to construct 'KeyframeEffectReadOnly': 2 arguments required, but only 1 present.
FAIL Test copied keyframeEffectReadOnly has the same keyframeEffectOptions Failed to construct 'KeyframeEffectReadOnly': 2 arguments required, but only 1 present.
FAIL Test copied keyframeEffectReadOnly has the same timing content Failed to construct 'KeyframeEffectReadOnly': 2 arguments required, but only 1 present.
Harness: the test ran to completion.

