Arrows: d-pad · X / Z: ACT / ESC · A / S: side buttons · P: pause · hold Tab: fast forward · + / -: volume · F2: reset · F6: record a GIF (again: save) · F7: speaker sound · F8: scaling · F9: stats · F1: help

Programs load from a file on this computer, from a URL, or with ?rom=name.bin from the folder the emulator is in (?rom=https://… works for any address that allows it). A games.json beside the page fills the Games menu. What a game saves stays in this browser.