chromium/third_party/blink/web_tests/transitions/multiple-background-size-transitions-expected.txt

PASS - "-webkit-background-size" property for "box" element at 0.5s saw something close to: 25% 25%, 25% 25%
PASS - "-webkit-mask-size" property for "box1" element at 0.5s saw something close to: 25% 25%, 25% 25%