<mtext>A&nbsp;</mtext> renders well in FF but fails in Chromium

[physikerwelt]

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Issue Summary

As described in https://phabricator.wikimedia.org/T375241 LaTeX input like $\text{A }$ creates the following rendering error in Chromium but renders fine in Firefox.

With a preprocessing script the LaTeX input is converted into MathML of this form

<mtext>A&nbsp;</mtext>

Is this the MathML representation the MathJax team recommends?

"TypeError: Cannot read properties of null (reading 'getElementsByTagName')\n    at e.tags (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:9238)\n    at e.transform (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/input/mml/extensions/mml3.js:1:2952)\n    at e.mmlFilter (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/input/mml/extensions/mml3.js:1:3057)\n    at e.execute (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:731579)\n    at t.executeFilters (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:36695)\n    at e.compile (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/input/mml.js:1:2287)\n    at t.compile (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:49304)\n    at t.compileMath (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:44016)\n    at t.compile (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:43529)\n    at Object.renderDoc (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:39265)"

Steps to Reproduce:

2. Login to https://www.mediawiki.org/
3. Select Client Side Math rendering in the preferences https://www.mediawiki.org/wiki/Special:Preferences#mw-prefsection-rendering-math
4. Goto https://www.mediawiki.org/wiki/Extension:Math/T375241

See that it works with FF but fails with Chrome.

Technical details:

• MathJax Version: 3.2.2
• Client OS: Mac OS X 10.8.4
• Browser: Chrome 131.0.6728.0

I am using the following MathJax configuration:

https://github.com/wikimedia/mediawiki-extensions-Math/blob/db81c960623d346ca8f43fb91ca3da92f868ea29/modules/ext.math.mathjax.js#L7

( function () {
	'use strict';
	const extensionAssetsPath = mw.config.get( 'wgExtensionAssetsPath' );
	window.MathJax = {
		loader: {
			// see https://docs.mathjax.org/en/latest/input/mathml.html
			load: [ '[mml]/mml3' ],
			// see https://docs.mathjax.org/en/latest/options/startup/loader.html
			paths: {
				mathjax: extensionAssetsPath + '/Math/modules/mathjax/es5'
			}
		}
	};
}() );

and loading MathJax via

<script src="/w/extensions/Math/modules/mathjax/es5/input/mml.js" charset="UTF-8"></script>
<script src="/w/extensions/Math/modules/mathjax/es5/input/mml/extensions/mml3.js" charset="UTF-8"></script>

Supporting information:

• Please supply a link to a (live) minimal example page, when possible:

https://www.mediawiki.org/wiki/Extension:Math/T375241

• If your issue is with the display of the mathematics produced by MathJax, include a screen snapshot that illustrates the problem, when possible.
  
  

• Check your browser console window for any error messages, and include them here.

"TypeError: Cannot read properties of null (reading 'getElementsByTagName')\n    at e.tags (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:9238)\n    at e.transform (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/input/mml/extensions/mml3.js:1:2952)\n    at e.mmlFilter (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/input/mml/extensions/mml3.js:1:3057)\n    at e.execute (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:731579)\n    at t.executeFilters (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:36695)\n    at e.compile (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/input/mml.js:1:2287)\n    at t.compile (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:49304)\n    at t.compileMath (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:44016)\n    at t.compile (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:43529)\n    at Object.renderDoc (https://www.mediawiki.org/w/extensions/Math/modules/mathjax/es5/tex-chtml.js?1d4e3:1:39265)"

• Include the MathJax configuration you are using, and the script tag that loads MathJax itself.

			load: [ '[mml]/mml3' ],

[dpvc]

This is a duplicate of #3030. WebKit and Blink seem to have difficulty processing the XSLT stylesheet used for the mml3 extension when the MathML contains   entities. The code example given there should resolve the issue for you, though you might need to change inputJax[0] to inputJax[1] depending on how MathJax is loaded.

[dpvc]

PS, this is already fixed in v4 (now out in beta release).

[physikerwelt]

Thank you. With your fix, we could fix the upstream but https://phabricator.wikimedia.org/T375241 in little time. This was very helpful.