MathJax 4 - problem with <mtext> in <mmultiscript> argument or just bad MathML?

[Mark Doyle]

Hi,

I am a bit rusty in MathML and MathJax. At the MathJax demo site (https://www.mathjax.org/#demo), MathJax renders this snippet containing an <mtext> tag for the hyphen in "58-61" as a subscript, but it should be a superscript:

<math><mmultiscripts><mi>Cu</mi><none/><mo>*</mo><mprescripts/><none/><mrow><mn>58</mn><mtext>–</mtext><mn>61</mn></mrow></mmultiscripts></math>

But changing the <mtext> tag to an <mo> tag works as expected:

<math><mmultiscripts><mi>Cu</mi><none/><mo>*</mo><mprescripts/><none/><mrow><mn>58</mn><mo>–</mo><mn>61</mn></mrow></mmultiscripts></math>

Is using <mtext> in this context incorrect or is this a MathJax 4 bug? Note this code comes from a production vendor for one of journals and works properly in their PDF formatter. That doesn't mean it is correct, of course! Thanks for any insights!

Best,

Mark

[Davide Cervone]

Mark:

It looks like the semantic enrichment is adding <none> elements into the expression (for some reason) and the parity is off, moving the superscript to a subscript.  I'll make an issue for this, and will look into what it going wrong.

I think <mtext> is a reasonable thing to use, here, but substituting <mo lspace="0" rspace="0"> seems like a good workaround for now.

Davide

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[Mark Doyle]

Thanks, Davide, for the quick reply! We'll use the workaround until the issue can be resolved.

Best,

Mark