Things I've found

TRS-80 Color Computer Extended BASIC Emulator in JavaScript

DONKEY.BAS shipped with early IBM PC DOS as a demo of color graphics and sound in BASICA. It was written by Microsoft co-founder Bill Gates and Neil Konzen in 1981 (version 1.10 in 1982). You only switch lanes — avoid the donkey, or BOOM.

This page recreates the original CGA gameplay in JavaScript with some liberties.

HTMX 4.0, the first JavaScript library to release exclusively on the Game Boy® platform!

https://swag.htmx.org/en-gbp/products/htmx-4-the-game

This is the story of how the "Space vs Tabs Holy War" ended, not through one side winning over the other but instead a technological invention making it the underlying source of tensions no longer being a thing.

Plain Vanilla: An explainer for doing web development using only vanilla techniques. No tools, no frameworks — just HTML, CSS, and JavaScript.

EstyJS is an emulator for the Atari ST, written in 100% pure JavaScript

PHONK is a coding playground for new and old Android devices.

Create scripts rapidly from your phone or using the remote Web Editor on your computer using Javascript. The API is simple and extensive. GUI, audio, graphics, Bluetooth BLE, Arduino, OSC, MIDI, and much more.