>
> Hi,
> The one plugin we know of which causes this is the HTMLValidator plugin
> for Firefox (which uses HTMLTidy), when it hits an iframe with a "data:"
> src url.
>
> http://users.skynet.be/mgueury/mozilla/download.html >
> - Do you have this installed?
> - Can you try disabling it, and then seeing if you get the error?
>
> This simple test page (no YUI code) will also cause the same error if
> you have the plugin installed:
>
> http://yuiblog.com/sandbox/yui/v241/examples/container/HTMLValidatorErro > r.html
>
> We can go from there.
>
> Thanks,
> Satyen
>