You can now play Half-Life 2 right inside your browser at over 100 FPS with save states & console support — Ingenious port recreates the entire game campaign using WebGL 2
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Summary
An unofficial browser port of Half-Life 2 has popped up online, allowing you to play the original campaign without downloading anything. Developed in just three months by Slqnt and 98006, it even features Source console integration for cheats.