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I found closed month ago issue #119.
But I have absolutely the same issue: Having a video within an iframe. Chrome does nothing when clicking on fullscreen, Firefox goes "full iframe". Both are the latest public versions.
Is is possible to play fullscreen video in iframe without that solution (open a new another window in full screen size)?
What do your think?
Yes, of course. You have to add the attribute allowfullscreen to the <iframe> tag (with all browser prefixes). Eg.:
<iframe src="..." width="..." height="..." frameborder="0" allowfullscreen webkitallowfullscreen mozallowfullscreen oallowfullscreen msallowfullscreen></iframe>
If you're unable to do this (because the video is already embedded somewhere without your access) you have to go with the workaround (new window in full size).