Technologies for web-based game execution include a computing device with a web rendering engine and a native game engine library. The web rendering engine establishes a scripting environment that issues calls to a game engine interface established by the web rendering engine. The scripting environment may be a JavaScript engine. In response to calls to the game engine interface, the game engine interface issues calls to the native game engine library. The native game engine library issues native graphics commands to a graphics bridge of the computing device. The native graphics commands may be OpenGL calls. The graphics bridge translates the native graphics commands to a web graphics context, which renders graphical game content to a web content element of the web rendering engine. The web graphics context may be a WebGL context, and the web content element may be a canvas element. Other embodiments are described and claimed.