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According to the Qt official blog , when the next Qt version 5.11.0 is released, as part of the Qt 5.11 toolkit update, they plan to release a technical preview of Qt for WebAssembly, which will allow you to run Qt applications directly within a browser window.
Qt for WebAssembly builds Qt applications as WebAssembly modules and is currently in development. Now that the Qt for WebAssembly Technical Preview has been released in Beta, Qt developers recommend using it with the Firefox browser, as it currently provides the fastest WASM compilation performance. Additionally, the module does not currently support Windows as a host platform.
The official wiki page provides additional information, including information on how to configure the environment and build packages.
If you want to download the experience, just log in to your Qt account and go to the "Download" area to get it.