To run C/C++ programs in a web browser, they need to be compiled into WebAssembly (Wasm).

 To run C/C++ programs in a web browser, they need to be compiled into WebAssembly (Wasm). Emscripten is a toolchain for this purpose, and it's especially useful when working with HTML's <canvas> element. While the Canvas is normally controlled via JavaScript, Emscripten provides the "Embind" library, which allows C++ code to directly access JavaScript objects (like document and canvas) and execute drawing commands. This makes it possible to control visual output from C++ logic. For example, you can call Canvas APIs like fillRect() from within C++ to draw shapes or apply colors. During compilation, the --bind flag is used to enable integration with JavaScript code. For simple rendering, the auto-generated HTML from Emscripten is sufficient. For more complex applications, developers may manage their own HTML and JavaScript code while using WebAssembly only for logic and rendering routines. This approach allows existing C/C++ codebases to be reused as part of modern web applications with dynamic visuals. The combination of WebAssembly and Canvas is highly effective for games, simulations, tools, and more.


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