Htmx 4.0, the first JavaScript library to release exclusively on the Game Boy
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HTMX 4.0 is a physical Game Boy cartridge, not a JavaScript library.
The htmx project released a physical Game Boy game called "htmx 4: the game" for $25. It has four levels of pickle-collecting, three biomes, and a final boss named Warren Buffering. Defeating the boss unlocks the source code for htmx 4.0. The game was written by Stephen Mitchell using GBStudio with heavy customizations. Carts were produced by Jarason Banes, with cover art by Ash. The game is an honest-to-goodness Mario Bros-inspired Game Boy game.
What commenters are saying
The thread is overwhelmingly positive, with many commenters praising the project's humor and craftsmanship. Several technical details emerge: the game uses GBStudio's built-in sound engine, runs on a real cartridge, and includes a source code reader at the end. One commenter notes the carts have an auto-loader that immediately resumes at the last checkpoint. The game developer and GBStudio's creator both appear in the thread, with the latter appreciating the Mario Land 2 references. Some commenters ask where to get a Game Boy, with responses pointing to the ModRetro Chromatic.