HTML.SafeIframe
TYPE: bool
VERSION: 4.4.0
DEFAULT: false
--DESCRIPTION--
<p>
Whether or not to permit iframe tags in untrusted documents. This
directive must be accompanied by a whitelist of permitted iframes,
such as %URI.SafeIframeRegexp, otherwise it will fatally error.
This directive has no effect on strict doctypes, as iframes are not
valid.
</p>
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