https://www.icyphoenix.com/viewtopic.php?f=4&t=2375&p=28116#p28116
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kUcHilla
Sun 27 Apr, 2008 21:46

Re: DANGEROUS - How To Allow IFRAME And Full HTML Parsing
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If you want add google maps iframe, you must change this to true:
'allow_empty' => [b]true[/b],