I did some net archaeology:
This was initially added to document-v11 DTD around 2003-03-20,
i gather as part of the alignment with xhtml at the time.
Soon after, the DTD changes since Forrest-0.4 were removed
and the new document-v12 was commenced in CVS on 2003-04-24:
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https://issues.apache.org/jira/browse/FOR-1255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15025988#comment-15025988
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David Crossley commented on FOR-1255:
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Added the "Conditional display of menuitems"
Thanks for the research and feedback. It seems those elements have been added
to the dtd, but without the corresponding changes to the skinning
transformations. I’ll have a look at that.
Sjur
> 25. nov. 2015 kl. 00:11 skrev David Crossley :
>
> I did some net archaeology: