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The mathjax tag has no usage guidance.
View source or install (you will need a plugin like GreaseMonkey for this).
What it does
For sites that don't have MathJax support, but occasionally need math, HTML codes like ∩…
This script is designed to improve the user experience while editing posts that include mathematical notation using MathJax. The editing code has not kept up with updates to MathJax, and so a numb…