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I saw in some project which it's possible to change the default build/compiling... Qt logo in Wasm, how it can be done?
Open your build directory and replace the image you find there - that's it, as long as you keep the file name.
I thought that was just an hack rather than a solution
No, that's the proper way to do it. The Qt logo and all the HTML, JS files generated in a project are just some example/ boilerplate code. You are free to replace it.