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Preventing additional JS from being parsed could possibly be done by modifying CEF, but it may cause quite a few issues with existing sources/overlays & wouldn't be as wise as informing developers about etiquette for displaying user-submitted data, since the issue will persist with other browsers.
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If you have a whitelist for users to have permission for it, it's definitely a lot less of a concern (since you can set it to only allow permitted users to be parsed directly while the rest are sanitized & only displayed as text), but it might not be as exciting/dangerous as allowing just anyone to.