[tex4ht] MathML errors using TeX4ht

[Francis Wright]

Attached is a MWE illustrating the MathML generation errors that I detected originally when using make4ht with mjcli. They appear to fall into two classes: text in a different font with a super- or sub-script; use of {} with a super- or sub-script. Please see also the comments at the end of the attached file.

Francis
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