Things to check to allow Joomla articles to contain iframe html elements:
- If you're using the MCE editor:
- Under Extensions, Plugins, Editor - Tiny MCE remove the iframe element from the Prohibited Elements field.
- If you're using the JCE editor:
- Go to Components, JCE Editor (Pro), Profiles, {Default} profile;
- Select Plugin Parameters, Media Support;
- Under Standard Parameters, set Allow IFrames to Yes.
- If you're using the RSFirewall plugin:
- Go to Components, RSFirewall, Blacklist/Whitelist and add a whitelist item of the IP address that needs to add the iframe element.
- OR
- Go to Components, RSFirewall, Exceptions;
- Add a new exception with the following options:
- Exception Type: Component
- Use Regular Expressions: No
- Match: com_content
- Skip PHP Protections: No
- Skip SQL Protections: No
- Skip JS Protections: Yes
- Skip Upload Protections: No
- Reason: Allow in content
- Published: Yes
- For more info: https://www.rsjoomla.com/support/documentation/rsfirewall-user-guide/frequently-asked-questions/scrambled-tags-iframe-becomes-i-frame.html