Chrome Version: 59.0.3071.86 (Official Build) (64-bit)

What steps will reproduce the problem?
(1) Run the attached test-expectations based test

What is the expected result?
#target is positioned at 0,0 in parent element.
Therefore, offsetTop should be 0

What happens instead?

offsetTop is 15. Probable cause is blink's FlippedBlocks coordinate system.
 

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