Behold, Diablo is fully playable in your browser
Briefly

The Diabloweb project allows users to run the original Diablo and its expansion Hellfire in any web browser with excellent controls and performance.
d07RiV modified the code for Diabloweb to remove all dependencies, allowing it to be compiled into WebAssembly, significantly improving event handling.
The project requires users to upload the DIABDAT.MPQ file, which can be sourced by owning the original game, purchasing it on GOG, or from a shareware version.
Despite its primitive gameplay compared to newer titles, playing the original Diablo remains an addictive experience, demonstrating the game's lasting appeal.
Read at Ars Technica
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