mathstodon.xyz now has a live preview and completion of LaTeX!
This has been on my to-do list for a long time. You no longer need to worry if LaTeX will display properly or not.
I've made a patch for just this feature at https://gist.github.com/christianp/629da435c959a6ed4853dce05dc155b4, though it's only really useful in conjunction with the rest of my mathstodon branch, which uses MathJax to render LaTeX in toot content: https://github.com/christianp/mastodon/tree/mathstodon-3.1.5
@christianp Thank you! I don't know how many times I've had to delete and repost for lack of this feature.
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