chromium/third_party/blink/web_tests/transitions/multiple-mask-transitions-expected.txt

PASS - "-webkit-mask-position" property for "box" element at 0.5s saw something close to: 40px 40px, 40px 40px
PASS - "-webkit-mask-position" property for "box2" element at 0.5s saw something close to: 40px 40px
PASS - "-webkit-mask-position" property for "box3" element at 0.5s saw something close to: 40px 40px, 40px 80px