Yep, the interrupt button doesn’t work either… nor do urllib, subprocesses, turtle, tcl and a raft of other things.
Outside of the standard library, it’s even more exciting, as one might be able to await piplite.install('some-package'), have it “work”, but then be missing some third-party, non-python library: graphviz is a good example.
Some of these might be fixable, in some browsers, and some of the might work with other hacks. But then, there’s stuff in the python standard library that doesn’t work on Windows, properly, so I guess we take what we can get!
At some point in the future, we’re hoping that a wasm-32 target for conda-forge might make some of these more plausible… but still not everything.