TinyMCE removes vimeo fullscreen code

[mafokken]

Not sure if this is the right place to put this.

When I embed a vimeo video using TinyMCE, I want it to allow fullscreen. But when I save the resource, the fullscreen code gets taken out when the editor reloads. So if I save the resoure again, the embedded video no longer shows the fullscreen option.

If I put this code into a resource:
<iframe src="https://player.vimeo.com/video/1234567" frameborder="0" width="500" height="281" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>

TinyMCE changes it to:
<iframe src="https://player.vimeo.com/video/1234567" frameborder="0" width="500" height="281"></iframe>