https://github.com/librespeed/speedtest
Self-hosted Speed Test for HTML5 and more. Easy setup, examples, configurable, mobile friendly. Supports PHP, Node, Multiple servers, and more - librespeed/speedtest
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Seen as the readme says this in the very next sentence, and they reference Flash, I think they're actually talking about the full fat Oracle Java runtime, not just Javascript.
Side note: I found a support page on speedtest.net that still says you need Flash installed, but only Flash, no Java required here: https://sandboxsupport.speedtest.net/hc/en-us/articles/202610754-What-are-the-requirements-to-use-Speedtest-net
JavaScript has nothing to do with Java. They are completely different languages and environments.
I'm aware. That's why I pointed out, to the person that conflated the two, that they are different.