css - clip-path on YouTube iframe -

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i trying make polygon clip-path work on youtube iframe. works on chrome , safari before video played (but not after), , not @ on firefox. have no idea why happening , have not found examples of clip-path working on youtube iframe.

<iframe width="320" height="256" src="https://www.youtube.com/embed/zkesoubvqds" style=" -webkit-clip-path: polygon(0 25%, 100% 16%, 100% 89%, 0 64%); clip-path: polygon(0 25%, 100% 16%, 100% 89%, 0 64%);`" frameborder="0"></iframe>

jsfiddle


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