[[wishlist]]
-> SVG can contain embedded javascript. The spec that you link to contains
+> SVG can contain embedded javascript.
+
+>> Indeed.
+
+>> So, a more general tool (`XML::Scrubber`?) will be necessary to
+>> refine both [XHTML][] and SVG.
+
+>> … And to leave [MathML][] as is (?.)
+
+>> — [[Ivan_Shmakov]], 2010-03-12Z.
+
+> The spec that you link to contains
> examples of objects that contain python scripts, Microsoft OLE
> objects, and Java. And then there's flash. I don't think ikiwiki can
> assume all the possibilities are handled securely, particularly WRT XSS
> attacks.
> --[[Joey]]
+>> I've scanned over all the `object` examples in the specification and
+>> all of those that hold references to code (as opposed to data) have a
+>> distinguishing `classid` attribute.
+
+>> While I won't assert that it's impossible to reference code with
+>> `data` (and, thanks to `text/xhtml+xml` and `image/svg+xml`, it is
+>> *not* impossible), throwing away any of the “insecure”
+>> attributes listed above together with limiting the possible URI's
+>> (i. e., only *local* and certain `data:` ones for `data` and
+>> `usemap`) should make `object` almost as harmless as, say, `img`.
+
+>>> But with local data, one could not embed youtube videos, which surely
+>>> is the most obvious use case?
+
+>>>> Allowing a “remote” object to render on one's page is a
+ security issue by itself.
+ Though, of course, having an explicit whitelist of URI's may make
+ this issue more tolerable.
+ — [[Ivan_Shmakov]], 2010-03-12Z.
+
+>>> Note that youtube embedding uses an
+>>> object element with no classid. The swf file is provided via an
+>>> enclosed param element. --[[Joey]]
+
+>>>> I've just checked a random video on YouTube and I see that the
+ `.swf` file is provided via an enclosed `embed` element. Whether
+ to allow those or not is a different issue.
+ — [[Ivan_Shmakov]], 2010-03-12Z.
+
+>> (Though it certainly won't solve the [[SVG_problem|/todo/SVG]] being
+>> restricted in such a way.)
+
+>> Of the remaining issues I could only think of recursive
+>> `object` — the one that references its container document.
+
+>> — [[Ivan_Shmakov]], 2010-03-12Z.
+
## See also
* [Objects, Images, and Applets in HTML documents][objects-html]
* [Uniform Resource Identifier — the free encyclopedia][URI]
[HTML::Scrubber]: http://search.cpan.org/~podmaster/HTML-Scrubber-0.08/Scrubber.pm
+[MathML]: http://en.wikipedia.org/wiki/MathML
[objects-html]: http://www.w3.org/TR/1999/REC-html401-19991224/struct/objects.html
[RFC 2397]: http://tools.ietf.org/html/rfc2397
[URI]: http://en.wikipedia.org/wiki/Uniform_Resource_Identifier
+[XHTML]: http://en.wikipedia.org/wiki/XHTML