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In the sense of using the platforms' libraries and APIs, then Chrome is not native (especially some of the UI as Javascript is not native in any sense) because
by experimental 15y ago
In the sense of using the platforms' libraries and APIs, then Chrome is not native (especially some of the UI as Javascript is not native in any sense) because it comes bundled with its own runtime as well as the WebKit runtime. But in terms of systems languages they are using yes that is native.