Output the expected failure message instead of undefined
Output the expected failure message instead of undefined

beni55/web-animations-js-legacy,web-animations/web-animations-js-legacy,web-animations/web-animations-js-legacy,web-animations/web-animations-js-legacy,beni55/web-animations-js-legacy,beni55/web-animations-js-legacy,beni55/web-animations-js-legacy