It's been established that Doom can run on produce, but porting wizardry doesn't start and end with blasting cacodemons on increasingly ludicrous hardware setups. It's sometimes the simple things that stick out most, like this web browser port of Half-Life 2. Not as silly as potatoes, but impressive all the same.
It's got some kinks—my frames are a mite inconsistent and certain animations seem to be broken—but it is, in fact, Half-Life 2 in the browser. You can play the game as normal, use console commands, and send your working hours down the drain with a spot of entertainment slightly more sophisticated than the average Flash game.