Just a small note. I have not been working with math formulas and HTML for almost a year. Instead I was heavily using Lyx and Latex, because I have been writing a book about ellipses in the context of Linear Algebra, multivariate calculus and multivariate statistics. So, I was very surprised when I returned to older posts in sister-blogs of this one to find that the Latex formulas typed in in MathML blocks of the WordPress block editor were and are no longer rendered within the editor session after leaving the blocks. However, they render perfectly in frontend-previews.

I asked GPT and Perplexity for a hint – and there came basically nothing useful – which astonished me a bit. Well, AI still is surprisingly stupid at times. I therefore tested the MathJax plugin which officially is assessed to be compatible with present WordPress versions. However, no rendering in block editor mode, either.

During some Internet quest I became aware of the “Math” block being standard these days in WordPress (since version 7.0. 2026). A quick tests showed that it supports both MathML and Latex. And I found it sufficient for my purposes.

So my strategy now is to leave the rendering of old pages to MathML and/or MathJax, but use the Math block for newer posts.

 
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And before we forget an old tradition in this blog: Keep fighting the Putler at all front lines which it opens.