Any time I paste iframe embed code from Vimeo into an item field, the fullscreen part of the code is stripped out - even before saving the changes to the item record.
I check the ‘Use HTML’ box, click HTML in the input field’s toolbar, and paste the iframe embed code. After I click the ‘Update’ button, I can open it immediately to view the embed code, and all the ‘fullscreen’ code (webkitallowfullscreen mozallowfullscreen allowfullscreen) is gone. In the public view of the saved item, the video displays normally, but the fullscreen icon just isn’t there.
I have tried editing the HTML Filtering section of the security settings to include the elements and attributes while using the filtering, and have also tried unchecking the filtering altogether, but neither of those makes any difference.
I have successfully embedded iframe code from another 3rd party, and this allows a fullscreen capability, but that isn’t part of the embed code, so is not the best comparison.
I can paste the same Vimeo embed code into a WordPress site, and the fullscreen option is available.
Thanks in advance for any assistance!