Problem with YouTube FullScreen Value

Using the default YouTube embed code, you aren't able to successfully embed a YouTube video in full screen format.

The way the embed code is set up, it isn't passing HTML validation with the editor.

Follow the allowfullscreen value in the string with ="true".

Example of non-working code from YouTube (under "Share" > "Embed"):

Example with change that resolves the problem:

This change lets the embed code pass HTML validation within a content block.

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