Demo
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You can see a demo by heading to:
+ leaving a comment.
Installation
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Copy xmlarea 'extensions'.
Ensure your .htaccess allows requests for .js + .html through (for the
popups).
Deactivate the Online Editor. I haven't got a copy but I presume they'll
conflict.
Activate extension + clear your caches.
Give the anonymous role rights to the xmlarea module.