LayoutTests/imported/w3c/web-platform-tests/css/css-animations/parsing/animation-duration-valid-expected.txt

PASS e.style['animation-duration'] = "3s" should set the property value 
PASS e.style['animation-duration'] = "500ms" should set the property value 
PASS e.style['animation-duration'] = "1s, 2s, 3s" should set the property value