Per review suggestion: https://phabricator.services.mozilla.com/D178876#5901710 The `two-clip-path-animation-diff-length*` WPTs have an animation that adjusts a value by 1px, and takes a snapshot near the start of the animation where we assume the value is still close-enough to its initial value. If the snapshot is a little bit later than expected, it might sample a fractional pixel value for that property and spuriously fail the test. As hiro notes, we can use `step-end` easing to avoid that problem.
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Per review suggestion: https://phabricator.services.mozilla.com/D178876#5901710 The `two-clip-path-animation-diff-length*` WPTs have animations that are expected to be sampled near the start of the animation where we assume the value is still close-enough to its initial value to be indistinguishable from that state. If the snapshot is a little bit later than expected, it might sample a fractional pixel value for that property and spuriously fail the test. As hiro notes, we can use `step-end` easing to avoid that problem.