Test the CSSOM of @keyframes. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS keyframeRule.toString() is "[object CSSKeyframesRule]" PASS keyframeRule.type is 7 PASS keyframeRule.name is "anim" PASS keyframeRule.findRule('from').cssText is "0% { left: 200px; }" PASS keyframeRule.findRule('to').cssText is "100% { left: 300px; }" PASS keyframeRule.findRule('from') is null PASS keyframeRule.findRule('from').cssText is "0% { left: 200px; }" PASS keyframeRule.cssRules[0].toString() is "[object CSSKeyframeRule]" PASS keyframeRule.cssRules[0].cssText is "100% { left: 300px; }" PASS keyframeRule.cssRules[0].keyText is "100%" PASS keyframeRule.cssRules[0].style.cssText is "left: 300px;" PASS keyframeRule.cssRules[1].toString() is "[object CSSKeyframeRule]" PASS keyframeRule.cssRules[1].cssText is "0% { left: 200px; }" PASS keyframeRule.cssRules[1].keyText is "0%" PASS keyframeRule.cssRules[1].style.cssText is "left: 200px;" PASS new CSSKeyframesRule().name threw exception TypeError: Illegal constructor. PASS successfullyParsed is true TEST COMPLETE