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We had the same issue with polymer / neon-animation. But since we had issues with web-animations-js dependency we are trying out our own polyfill for play() based on KeyframeEffect documentation

(function () {
  if (document.timeline && !(document.timeline as any).play) {
    (document.timeline as any).play = (effect: KeyframeEffect) => {
      const animation = new Animation(effect, document.timeline);
      animation.play();
      return animation;
    };
  }
})();

under the assumption that neon-animation is the only dependency relying on timeline.play() and that the native web animations API is available, this seems to work. Does anyone have any ideas why this should not work? Or what side effects this can cause?

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