The popular JCE editor has a few options focused on HTML filtering and output: Validate HTML and Doctype selection, which can be found in the “Editor Global Configuration” tab or inside the available profiles’ settings. Navigate to components -> JCE -> Editor Profiles -> Default -> Editor Parameters -> Options to access these options.
Please check also “Advanced” tab where you can set which elements are allowed and which are not. Check that the Allow Javascript or Allow CSS or Allow PHP options are set to Yes – depending on which code type you need to insert.
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