React Js Get Element Position

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState, useEffect, useRef } = React;

function App() {
            const myElementRef = useRef(null);
            const [top, setTop] = useState('');
            const [bottom, setBottom] = useState('');
            const [left, setLeft] = useState('');
            const [right, setRight] = useState('');
            const [width, setWidth] = useState('');
            const [height, setHeight] = useState('');

useEffect(() => {
                const el = myElementRef.current;
                const rect = el.getBoundingClientRect();
                setTop(rect.top);
                setBottom(rect.bottom);
                setLeft(rect.left);
                setRight(rect.right);
                setWidth(rect.width);
                setHeight(rect.height);
            }, []);

return (
                <div className="container">
                    <h3>React Js Get Element Position</h3>
                    <div ref={myElementRef}>This is my element</div>

<pre>Top: {top}</pre>
                    <pre>Right: {right}</pre>
                    <pre>Bottom: {bottom}</pre>
                    <pre>Left: {left}</pre>
                    <pre>Height: {height}</pre>
                    <pre>Width: {width}</pre>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        * {
            box-sizing: border-box;
        }

.container {
            margin: 0 auto;
            width: 600px;
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }

h3 {
            margin-top: 0;
            color: #333;
        }

pre {
            margin: 0;
            color: #777;
        }

pre:first-child {
            margin-top: 10px;
        }

pre:not(:last-child) {
            margin-bottom: 10px;
        }
    </style>
</body>

</html>