One caveat I should mention is that mobile viewport stuff (which is used in
RDM as well) relies on the fact that Document::IsTopLevelContentDocument
returns true. The function actually returns true for the document of
``. So please make sure it still returns true for the
replacement or add an
in non-chrome documents has been unsupported
in production environments for some time. Maintaining support
for it in content processes has become increasingly difficult in
the light of Fission, to the point that we've decided it is time
to fully remove support. Since support is disabled by
Thanks Kris.
Related to this: RDM (Responsive Design Mode, in DevTools) is one of the
consumers of . We've been at work removing the
dependency from RDM on this type of iframe, and are nearing the completion
of the main bucket of work. By March this year, we should have a new, fully
functional
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