I wanted to request support for loading and using additional LaTeX packages. For example, I often need to embed chemical equations within my notes using the mhchem package. I’m not sure if this would be implemented behind-the-scenes or through the custom CSS, but would love to see a toggle or option for this. Thanks so much!
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This would also be really useful for me, even if at first it was just restricted to standard packages like amsmath, tikz etc.
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mhchem is love…
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I second that! Packages (or rather: MathJax extensions) that would be game changers for me would be: xypic.js (https://sonoisa.github.io/xyjax_ext/xypic.js), AMSmath.js and AMSsymbols.js, as well as the ability to define new macros 
I’ve just opened a feature request: MathJax extensions
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We will add the full set of mathjax packeges in a future release. If you want other packages, maybe you can load them when the plugin interface will be available.
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Did anything ever happen with this? I haven’t been following Obsidian development too closely with the plugins and all, can one do this nowadays?