EmulatorJS 4.2.3 is distributed under GPL-3.0. The vendored emulator.min.js changes video_top_portrait_viewport from true to false. The original preferred source is in emulatorjs-source.zip. This application sizes and centers its game iframe and supplies its own touch controls. Core source repositories: https://github.com/libretro/gambatte-libretro and https://github.com/EmulatorJS/mgba . Each downloaded core package embeds its core license.