REPRO: Load attached test file EXPECTED: Blue block animating to yellow repeatedly ACTUAL: Nothing. Console shows undefined exception. WebKit's CSSKeyframesRule interface exposes insertRule() instead of appendRule() per css-animations [1]. Firefox and IE work as expected. Chrome has the same issue. [1] http://dev.w3.org/csswg/css-animations/#interface-csskeyframerule
*** This bug has been marked as a duplicate of bug 57910 ***