Clients often break the HTML in content assets/slots by accidentally deleting opening or closing tags. It would be great if the extension was able to validate the HTML before submitting it and prevent the submission if the HTML is not valid.

I know that in some cases people intentionally add extra opening/closing tags, and while this is not a good practice, there would need to be an opt-out setting to skip the validation (a configuration in the extension settings page, a dialog on submission that lets you submit with invalid HTML or both).

Alternatively, instead of preventing the submission, the extension could also just add a red text message saying that the HTML is invalid below or above the input box whenever the value changes.