react/props2.html at master · Coen90/react · GitHub

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<!DOCTYPE html>
<html>
  <body>
    <div id="root"></div>
  </body>
  <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.production.min.js"></script>

  // can define prop types through this
  <script src="https://unpkg.com/prop-types@15.7.2/prop-types.js"></script>

  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  <script type="text/babel">
    function Btn({ text, fontSize = 14 }) {
      return (
        <button
          style={{
            backgroundColor: "tomato",
            color: "white",
            padding: "10px 20px",
            borderRadius: 10,
            border: 0,
            fontSize,
          }}
        >
          {text}
        </button>
      );
    }
    Btn.propTypes = {
      text: PropTypes.string.isRequired,
      fontSize: PropTypes.number,
    };
    const MemorizedBtn = React.memo(Btn);
    function App() {
      return (
        <div>
          <Btn text="Save Changes" fontSize={18} />
          <Btn text={"Continue"} />
        </div>
      );
    }
    const root = document.getElementById("root");
    ReactDOM.render(<App />, root);
  </script>
</html>