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React Components can almost do this. There are React dev tools to inspect each Component on the page (not just html element). You could jump to source and copy/paste the Component in another app.

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I work in React daily and, unfortunately, it's nothing like what I'm describing and what Hypercard hinted at. React is for developers in 2018. Hypercard-like things are for personal computer users of all variety.

ALGOL and Simula 67 are also great languages for this. In those languages, code can be simply copied from one program into another, thereby imbuing the second program with functionality from the first.

I'm personally fond of Malbolge with Rust-bindings, but that's not quite as popular as React yet.

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