Comparing sort algorithms may not be best example

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Your comparing algorithms example is great for visualizing individual sorting algorithms, but is problematic if it is used to compare algorithms.

Here is a nice site that does compare algorithms properly: https://www.toptal.com/developers/sorting-algorithms/

However, it does so by animating snapshots at particular points. This is hard to do with running javascript because the amount of code run between visualization updates is different.

My suggestion would be do not compare algorithms by having more than one at a time, but merely selecting one. Another possibility would be to rewrite the code in your pyodide Python using generators, so that each co-routine would be in sync.