YouTube iframe embed - full screen

React.JS People, remember allowFullScreen and frameBorder="0"

Without camel-case, react strips these tags out!

In the current YouTube iframe (2021), you have to add fullscreen to the allow attribute:

<iframe allow="fullscreen;">

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If I understand correctly you have an iframe that contains a second iframe (the youtube one).
Try adding the allowfullscreen attribute to the "parent" iframe.

For full browser support it should look like this:

<iframe src="your_page_url" 
        allowfullscreen="allowfullscreen"
        mozallowfullscreen="mozallowfullscreen" 
        msallowfullscreen="msallowfullscreen" 
        oallowfullscreen="oallowfullscreen" 
        webkitallowfullscreen="webkitallowfullscreen"> </iframe>