In order to determine the difference of the two images once can: 1) Generate the pictures in the browser from the base64 strings. 2) Save then as test.png and reference.png. 2) On Linux on can use ```compare test.png reference.png -compose src diff.png``` to determine it. I've attached the pictures. It turned out, the border color of two pixels differs. Moreover, it could be this failure happens only on Android, as at least some of the non-Android failures were wrongly linked to this issue.
Bug 1513637 Comment 11 Edit History
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In order to determine the difference of the two images one can: 1) Generate the pictures in the browser from the base64 strings. 2) Save then as test.png and reference.png. 2) On Linux on can use ```compare test.png reference.png -compose src diff.png``` to determine it. I've attached the pictures. It turned out, the border color of two pixels differs. Moreover, it could be this failure happens only on Android, as at least some of the non-Android failures were wrongly linked to this issue.