How to add HTML5 required on wp_editor

The visual editor is not a textarea, it is an iframe, therefor even if you could set an attribute it will do nothing. You can set the attribute on the hidden textarea that will be sent to the server but since it is hidden I am not sure how an alert about it not being filled will be displayed and it might be different between browsers (it is hidden so there is no obvious visual anchor for the display of the alert)

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