Upgrade MathJax to 4.1.1.

[drgrice1]

The issue with link styles has been fixed, and the workaround in the js/MathJaxConfig/bs-color-scheme.js file removed.

The other issue with the --mjx-bg-alpha versus --mjx-bg1-alpha variable has not been fixed. This should probably be brought to the attention of @dpvc.

[dpvc]

Can you say where the --mjx-bg-alpha issue is discussed? I can' seem to find it.

Note that the definition of --mjx-bg1-color should get replaced when MathJax starts up, and the new value should reference --mjx-bg1-alpha, if you are concerned about its initial value.

[drgrice1]

@dpvc: Sorry, I should perhaps have been more detailed. I don't think that --mjx-bg-alpha is discussed online anywhere. I mentioned it in our developer meeting. I believe that there is a bug in the MathJax code on this. The -mjx-bg-alpha css variable is used in the ts/a11y/explorer/Region.ts file in the https://github.com/mathjax/MathJax-src repository. It defines the --mjx-bg1-color variable as '--mjx-bg1-color': 'rgba(var(--mjx-bg-blue), var(--mjx-bg-alpha))'. However, I don't believe the --mjx-bg-alpha css variable is ever defined anywhere. However, the --mjx-bg1-alpha variable is, and I think that is the variable that was meant to be used in the ts/a11y/explorer/Region.ts file.

However, I may be mistaken. I just know that by adding

	Region[region].style.styles["[data-bs-theme='light']"]['--mjx-bg1-color'] =
		'rgba(var(--mjx-bg-blue), var(--mjx-bg1-alpha))';

to the custom extension it fixes the MathJax explorer background color issue I see.

[dpvc]

Yes, that should be --mjx-bg1-alpha, but it should also be replaced via a call to setColor() during the initialization of the menu (unless you have disabled the menu). I will fix it in the next release, but under usual circumstances, the initial value of --mjx-bg1-color will be overwritten.

Are you disabling the MathJax menu?

[drgrice1]

We are not disabling the menu.