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Allow full screen

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I'm creating an elearning course which displays a YouTube video. When I 
preview the course in my browser the video's full screen button is enable.

If I load the course into a learning management system (LMS) the full 
screen button is disabled. Dr Google tells me that's because the IFRAME 
which contains the video or a parent frame does not have the attribute 
allowfullscreen.

When I look at the source the LMS creates when it displays the course I 
can see that the video is within an IFRAME, which is within a HTML 
document, within a FRAME, within a FRAMESET, within another FRAME, 
within a another FRAMESET.

I cannot directly edit the source that the LMS creates. I have added the 
allowfullscreen attribute to the IFRAME that contains the video and I tried

var frm = window.frameElement;
while (frm) {
    frm.setAttribute("allowfullscreen","");
    frm = frm.frameElement;
}

but it appears that a FRAMESET returns null.

My question is how do I move "up the tree" though any nested FRAMESET to 
add the attribute to all parent FRAMES and, if I do, will the attribute 
actually be "noticed" by the video (seeing its been added after the page 
has been rendered)?

Andrew Poulos

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Allow full screen Andrew Poulos <ap_prog@hotmail.com> - 2016-08-01 15:26 +1000
  Re: Allow full screen Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-08-01 11:23 +0200
    Re: Allow full screen Andrew Poulos <ap_prog@hotmail.com> - 2016-08-02 10:58 +1000
    Re: Allow full screen Andrew Poulos <ap_prog@hotmail.com> - 2016-08-02 13:28 +1000

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