https://www.icyphoenix.com/viewtopic.php?f=4&t=2375&p=48141#p48141
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Mighty Gorgon
Wed 03 Mar, 2010 10:12

Re: BBCODE - CUSTOMIZATION - DANGEROUS - How To Allow IFRAME And Full HTML Parsing
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You need to alter Icy Phoenix code for doing that... currently there is no easier way.