We are pleased to announce that math expressions can now be rendered natively in Markdown on GitHub.

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From today, you can use the $ and $$ delimiters natively in Markdown on GitHub to insert math expressions. This content is then rendered using the highly popular MathJax library. Mathematical expressions are key to information sharing amongst engineers, scientists, data scientists and mathematicians.

Math support in Markdown

It’s about time to add this feature, it’s too important.

Wow, I didn’t even think that could be possible

Allowing extensions would be neat, but I’m not sure if they would do that.
Cool stuff though.