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html
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<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
<script crossorigin src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>
</head>
<body>
<div id="root">loading</div>
<script type="text/babel">
const {useState}=React
function Toggle () {
const [val,setVal] = useState ("ON");
function toggle () {
setVal ((val=="ON")?"OFF":"ON");
}
return <div>
<p>{val}</p>
<button onClick={toggle}>{val}</button>
</div>;
}
const el = <Toggle />;
ReactDOM.render (el,
document.getElementById ("root")
);
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css
css
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body {
}
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js
js
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