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I think he means making the checkbox components reactive and extendable in React.js.

That's not an easy thing to do.

Not sure why not. And what would you want to extend on a checkbox? It's a boolean switch.

At times I have wanted a tri-state checkbox, as well as a quantum checkbox. To each his own I guess.

set it to display:none and toggle state on mousemove => Schrödinger's checkbox :)

Extendable for CSS purposes.