Adding source type information to the "show math" popup

I've recently been asked about identifying the source-type of a "show math" popup. If I didn't miss anything, MathJax doesn't provide explicit information on the source type in the HTML of the popup.

For processing a copy&paste coming from the popup (regardless of the type), it's helpful to identify the type. With MathML source, that's easy since we provide the delimiters <math></math>. Before v2.0 it was easy because the only alternative was TeX. But with AsciiMath, confusion arises...

I think it would be useful if MathJax provided an easier way to identify the source type. For example, a table-id indicating the type and an alt-string with the content would solve this.

Any thoughts?