ONNXRuntime makes it fairly easy, you just need to provide a path to the ONNX file, give it inputs in the correct format, and use the outputs. The ONNXRuntime library handles the rest. You can see this in the main.js file: https://github.com/clowerweb/kitten-tts-web-demo/blob/main/m...

Plus, Python software are dependency hell in general, while webpages have to be self-contained by their nature (thank god we no longer have Silverlight and Java applets...)