memory leak and infinite loop with <tex-html>

Created by: christianp

Issue Summary

I wanted to have a look at the v4 alpha, and set up a minimal page to try out the <tex-html> feature. It worked fine with one <input> tag in a <tex-html> tag inside a LaTeX expression, but having two tags locks up my browser and then makes it quit once the PC runs out of memory. I guess there's an infinite loop somewhere producing tonnes of memory, but it's hard to debug because my browser keeps crashing!

Steps to Reproduce:

I've set up a page on glitch: https://glitch.com/edit/#!/mathjax-v4-testing?path=index.html%3A15%3A8

The only bit of LaTeX in the page is this:

\[ 
      \begin{pmatrix}
        <tex-html><input name="p00"></tex-html> & 0 \\
        <tex-html><input name="p11"></tex-html> & 0 \\
      \end{pmatrix}
      = 5
      \]

Technical details:

• MathJax Version: 4.0.0-alpha.1
• Client OS: Ubuntu 22.04
• Browser: Firefox 105.0.3

I am using the following MathJax configuration:

MathJax = {
  loader: {load: ['[tex]/texhtml']},
  tex: {
      allowTexHTML: true,
      packages: {'[+]': ['texhtml']}
  }
};

and loading MathJax via

    <script src="https://cdn.jsdelivr.net/npm/mathjax@4.0.0-alpha.1/es5/tex-mml-chtml.js"></script>