React Js Get Element Height and Width

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState, useRef, useEffect } = React;

function App() {
            const myElementRef = useRef();
            const [height, setHeight] = useState("");
            const [width, setWidth] = useState("");

useEffect(() => {
                const element = myElementRef.current;
                const width = element.offsetWidth;
                const height = element.offsetHeight;
                setHeight(height);
                setWidth(width);
            }, []);

return (
                <div>
                    <h3>React Js Get Element Height and Width</h3>
                    <div ref={myElementRef} style={{ border: "1px solid #ccc" }}>
                        This is my element.
                        <p>Height of Element: {height}</p>
                        <p>Width of Element: {width}</p>
                    </div>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        div {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }

div[style] {
            position: relative;
        }

p {
            font-size: 1rem;
            margin: 0.5rem 0;
        }
    </style>
</body>

</html>

 
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState, useRef, useEffect } = React;
​
        function App() {
            const myElementRef = useRef();
            const [height, setHeight] = useState("");
            const [width, setWidth] = useState("");
​
            useEffect(() => {
                const element = myElementRef.current;
                const width = element.offsetWidth;
                const height = element.offsetHeight;
                setHeight(height);
                setWidth(width);
            }, []);
​
            return (
                <div>
                    <h3>React Js Get Element Height and Width</h3>
                    <div ref={myElementRef} style={{ border: "1px solid #ccc" }}>
                        This is my element.
                        <p>Height of Element: {height}</p>
                        <p>Width of Element: {width}</p>
                    </div>
                </div>
            );
        }
​
        ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        div {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
​
        h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }
​
        div[style] {
            position: relative;
        }
​
        p {
            font-size: 1rem;
            margin: 0.5rem 0;
        }
    </style>
</body>
​
</html>