PASS getTransformStyle("blend-mode-normal-with-transform-style-preserve-3d") is "preserve-3d"
PASS getTransformStyle("blending-with-transform-style-preserve-3d") is "flat"
PASS getTransformStyle("blending-with-transform-style-flat") is "flat"
PASS successfullyParsed is true

TEST COMPLETE
Test that an element with mix-blend-mode other than normal forces the computed value of transform-style to flat.