Fullscreen not working when playing within iframe

video.js

https://github.com/videojs/video.js/issues/148

1
<iframe src="..." width="..." height="..." frameborder="0" allowfullscreen webkitallowfullscreen mozallowfullscreen oallowfullscreen msallowfullscreen></iframe>

HTMLIFrameElement - Web API 接口参考 | MDN