Line Breaking in MathJax

[Amine Marref]

Hello,

I have a question on line breaking in MathJax. I am attaching a figure that shows a side-by-side visual comparison between MathJax-rendered equations in versions 2.7.9 and 3.1.2 respectively.

The figure shows 4 rendered equations of the form f'(x)=rational function. In the left (v 2.7.9), we can see that the rendering algorithm decided to put f'(x) in different places in the two equations. In the right (v 3.1.2), we can see that the rendering algorithm decided to be a little bit more consistent.

My first question is: how do I instruct the rendering process in v 2.7.9 to display my equations in a consistent way?

My second question is: if it is possible to instruct the rendering to be consistent, how would I force the rendering to be the one in the equation marked with a green asterisk?

Many thanks.

For reference, the following is the configuration bit for the line-breaking.

<!-- LINE BREAKING CONFIGURATION FOR VERSION 3.1.2 -->

<script type="text/x-mathjax-config">                

        MathJax.Hub.Config({

                "HTML-CSS": { linebreaks: { automatic: true } },

                SVG: { linebreaks: { automatic: true } }

         });

</script>

 <!-- LINE BREAKING CONFIGURATION FOR VERSION 2.7.9 -->     

<script type="text/x-mathjax-config">

            MathJax.Hub.Config({

            CommonHTML: { linebreaks: { automatic: true } },

            "HTML-CSS": { linebreaks: { automatic: true } },

                    SVG: { linebreaks: { automatic: true } }

            });

</script>

[Davide Cervone]

There are a couple of things to say, here.  First, what you claim to be your v3 configuration is actually a v2 configuration and will not affect version 3 in any way.  Version 3 does not have MathJax.Hub, and does not have the HTML-CSS output renderer (only the CommonHTML one).  MathJax version 3 is configured in a different way, see

https://docs.mathjax.org/en/latest/web/configuration.html

and the configuration conversion tool at

https://docs.mathjax.org/en/latest/web/configuration.html#converting-your-v2-configuration-to-v3

so this v2 configuration will be completely ignored by version 3.

Second, version 3 does not yet implement the line breaking algorithm, see

https://docs.mathjax.org/en/latest/upgrading/v2.html?highlight=line%20breaking#not-yet-ported-to-version-3

so the breaking your re seeing is not due to MathJax.  Since the math should not be broken, I can only assume that some CSS on the page is overriding MathJax's CSS to allow the browser to insert line breaks where MathJax would have prevented it.  I can't tell without seeing the page.  In any event, the line breaking is not being done by Mathjax, and that would account for the poor layout.

Finally, automatic line breaking within fractions is done to the full width of the available content, not to the space "left over" from other content.  This is a last-ditch effort to get your content displayed, so can lead to sub-optimal layout, as in your second example.  your first example only works well because the various terms have sufficient nesting to prevent internal line breaks, so there is enough left-over space for the function and equal sign; the second has longer terms, so there is no space left over.  You can force line breaks in your fractions at better location, or could implement TeX macros that help control the breaking, as described in this post

https://groups.google.com/g/mathjax-users/c/Uaaht3cGJu8/m/X7aplu8UQncJ

There is more detail about how the line breaking works at

https://github.com/mathjax/MathJax/issues/1916

though this is a discussion about MathML rather than TeX input.  In any case, the fact that fractions break to the full width of the container is not something you can change.

Davide

[Amine Marref]

Thanks a lot for the clarification :-)

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