One possible source of MathJax documentation on tables is a tutorial and quick reference page on Stack Exchange. It explains how to create arrays and tables with the array environment, how to align columns, how to add horizontal and vertical lines, and how to use multirow and multicolumn cells:

* https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference

Another possible source is the official MathJax documentation, which covers various aspects of using MathJax in web pages, such as installation, configuration, input formats, output formats, accessibility features, extensions, and more:

* http://docs.mathjax.org/en/latest/

* https://www.math.toronto.edu/MathJax/docs/html/index.html
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