MathML in SVG in MathML

Background:

• itex has an svg environment which allows the user to embed SVG figures in equations:

  $ ... \begin{svg} ... SVG goes here ... \end{svg} ... $

• There is an extension for SVG-Edit, which allows the user to embed MathML in an SVG figure.

MathJax seems to work fine if you use one or the other of these mechanisms. That is, it seems to handle SVG-in-MathML and MathML-in-SVG (both inside an (X)HTML host document).

But if you try to use both mechanisms (creating, say, MathML-in-SVG-in-MathML), MathJax craps out, and renders the result poorly, if at all.

Is this an architectural limitation that we should just learn to live with, or is it a bug that could be fixed?

I can assure you that there are good use-cases for MathML-in-SVG-in-MathML. So it would be nice if MathJax supported it.

I can supply a test case, if needed.

Start by constructing a minimal browser test that combines MathML-in-SVG-in-MathML, using the separate SVG-in-MathML and MathML-in-SVG cases as controls. Trace MathJax's handling of the nested elements and determine whether the combined case can render reliably; done means the supplied nesting renders correctly without regressing either individual case.