mtextInheritFont causes text subscript spacing issue

[David Farmer]

This page has "mtextInheritFont: false", and things look fine:

https://aimath.org/~farmer/tmp/textinheritfalse.html

This one has "true" and is identical otherwise. There is extra space
after the \text{...} which occur in a subscript.

https://aimath.org/~farmer/tmp/textinherittrue.html

For \text{...} outside a subscript, it looks the okay but the font sizes
are different.

If I eliminate the inline style:

mjx-utext {
display: inline-block;
}

then the spacing is okay.

Is it reasonable for me to just add css to set display: inline on those
elements? If I do it only when inside a mjx-msub then it seems unlikely
there will be undesirable side-effects.

Regards,

David

[Davide Cervone]

David:

Thanks for reporting the issue.  It turns out that this is due to a workaround for a Safari bug.  MathJax needs to add an explicit width to the mjx-utext node in to avoid a rendering error in Safari, but MathJax is neglecting to scale the size properly for subscripts (or other scaled content).

A work-around would be the following configuration:

MathJax = {

  chtml: {

    mtextInheritFont: true

  },

  startup: {

    ready() {

      const {CHTMLTextNode} = MathJax._.output.chtml.Wrappers.TextNode;

      const {CHTMLWrappers} = MathJax._.output.chtml.Wrappers_ts;

      

      CHTMLWrappers[CHTMLTextNode.kind] = class extends CHTMLTextNode {

        toCHTML(parent) {

          super.toCHTML(parent);

          if (this.parent.variant === '-explicitFont') {

            const adaptor = this.adaptor;

            const node = adaptor.lastChild(parent);

            if (!adaptor.getStyle(node, 'width')) return;

            const metrics = this.jax.math.metrics;

            const scale = this.parent.getBBox().scale;

            const width = this.getBBox().w * metrics.em * metrics.scale * scale;

            adaptor.setStyle(node, 'width', Math.round(width) + 'px');

          }

        }

      }

      

      MathJax.startup.defaultReady();

    }

  }

};

It appears, however, that recent versions of Safari no longer have the bug, so you could use

mjx-utext {

  width: initial ! important;

}

to have these widths ignored if you don't care about older versions of Safari.  I don't know about the status of this bug in other WebKit-based browsers, but I assume some of them will also have the problem that these widths are supposed to be fixing.

Davide

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