Vertical double bar not rendered in Firefox on Linux

[prisae]

Issue Summary

Vertical double bar (\lVert, \rVert) not rendered in Firefox on Linux.

Steps to Reproduce:

See Supporting information.

Technical details:

• MathJax Version: src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"
• Client OS: Ubuntu 20.04
• Browser: Firefox 90.0; Chrome 91.0 edit/clarification: Chrome works; Firefox does not work

Supporting information:

Example: ~https://emg3d.emsig.xyz/en/latest/api/emg3d.optimize.misfit.html~ https://emg3d.emsig.xyz/en/stable/api/emg3d.simulations.Simulation.html#emg3d.simulations.Simulation.misfit

[dpvc]

I am not able to reproduce your result (on Mac OS; I need to set up an Ubuntu 20 VM). Can you verify that you are getting version 3.2.0 and not an older cached version? (Use the "About MathJax" item in the MathJax contextual menu.)

Also, does it appear if you zoom in or out?

[prisae]

Yes, it shows that it is version 3.2.0, both in Firefox and in Chrome. It works fine in Chrome/Chromium, but not in Firefox.

[dpvc]

Do the vertical bars appear if you change the zoom level?

[prisae]

Ha, yes!

[dpvc]

OK, thanks. I'll have to install an Ubuntu VM to test further.

[prisae]

30/40/60/70/100 % do not work, the rest does.

[taniwallach]

I wonder if this is the twin of the problem with horizontal extenders. https://github.com/mathjax/MathJax/issues/2795

That was acknowledges to be a bug in Firefox https://bugzilla.mozilla.org/show_bug.cgi?id=1741887 but it does not seem to be something which is high enough a priority for them to fix soon.

[prisae]

I just realized that the link I provided does not work any longer. Here an update: https://emg3d.emsig.xyz/en/stable/api/emg3d.simulations.Simulation.html#emg3d.simulations.Simulation.misfit

However, the problem still exists.

[DestyNova]

I see similar behaviour in Firefox on Linux (but not Chromium) with single vertical bars in this formula:

$$ A = \frac{1}{2} \left\vert{\sum_{i=1}^n {(x_{i+1}+x_i)(y_{i+1}-y_i)}}\right\vert $$

They do reappear upon increasing the zoom to 110% or greater.