Updated: April 14, 2012 at bottom. Added Step 9.
With an upgrade to, the option for text filtering automatically turns back on because the option has moved from the to Global Configuration. Text filtering is useful if you want to restrict authors from inserting tags or harmful HTML code into your articles that might cause errors to your site. But as a Super User, most cases you need to add HTML code or IFRAME codes into your articles, so you will turn off text/html filtering.
In previous version – here) but , text filtering has moved to the Global Configuration., this option was found in the – Options (You can see the post
See below how to turn off Text Filtering:
1. Login to yourAdministrator backend
2. Click on Site, Global Configuration
3. Switch to the ‘Text Filters” tab
4. Under ‘Text Filter Settings’, ‘Filter Groups’, set the following:
- Super Users = No Filtering
5. Click on ‘Save & Close’
Now you can try to add HTML and IFRAME code into your2.5 articles and should not be stripping your code. If you are still having problems, you can try the following:
6. Go back into the ‘Text Filters’ tab and under ‘Filter Groups’, set:
- Super Users = Default Black List
7. Click on ‘Save & Close’
8.Then repeat Step 4 and 5 above.
Updated from William’s Comment (Thanks William):
9. TinyMCE is default editor. It also strips the iframe.
Basic Options -> Prohibited Elements
remove iframe from the list
Hope that helps you.