Added an <object /> wishlist item.

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+IIUC, the current version of [HTML::Scrubber][] allows for the `object` tags to be either enabled or disabled entirely.  However, while `object` can be used to add *code* (which is indeed a potential security hole) to a document, reading [Objects, Images, and Applets in HTML documents][objects-html] reveals that the “dangerous” are not all the `object`s, but rather those having the following attributes:
+
+    classid     %URI;          #IMPLIED  -- identifies an implementation --
+    codebase    %URI;          #IMPLIED  -- base URI for classid, data, archive--
+    codetype    %ContentType;  #IMPLIED  -- content type for code --
+    archive     CDATA          #IMPLIED  -- space-separated list of URIs --
+
+It seems that the following attributes are, OTOH, safe:
+
+    declare     (declare)      #IMPLIED  -- declare but don't instantiate flag --
+    data        %URI;          #IMPLIED  -- reference to object's data --
+    type        %ContentType;  #IMPLIED  -- content type for data --
+    standby     %Text;         #IMPLIED  -- message to show while loading --
+    height      %Length;       #IMPLIED  -- override height --
+    width       %Length;       #IMPLIED  -- override width --
+    usemap      %URI;          #IMPLIED  -- use client-side image map --
+    name        CDATA          #IMPLIED  -- submit as part of form --
+    tabindex    NUMBER         #IMPLIED  -- position in tabbing order --
+
+Should the former attributes be *scrubbed* while the latter left intact, the use of the `object` tag would seemingly become safe.
+
+Note also that allowing `object` (either restricted in such a way or not) automatically solves the [[/todo/svg]] issue.
+
+For Ikiwiki, it may be nice to be able to restrict [URI's][URI] (as required by the `data` and `usemap` attributes) to, say, relative and `data:` (as per [RFC 2397][]) ones as well, though it requires some more consideration.
+
+— [[Ivan_Shmakov]], 2010-03-12Z.
+
+[[wishlist]]
+
+## See also
+
+* [Objects, Images, and Applets in HTML documents][objects-html]
+* [[plugins/htmlscrubber|/plugins/htmlscrubber]]
+* [[todo/svg|/todo/svg]]
+* [RFC 2397: The “data” URL scheme. L. Masinter. August 1998.][RFC 2397]
+* [Uniform Resource Identifier — the free encyclopedia][URI]
+
+[HTML::Scrubber]: http://search.cpan.org/~podmaster/HTML-Scrubber-0.08/Scrubber.pm
+[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