title: What exactly <React.StrictMode></React.StrictMode> component does?
body: <p>I found this component inside a React practice, but i don't know what's the exact behavior. </p>
  
  <p>e.g.</p>
  
  <pre><code>const App = () =&gt; {
    return (
      &lt;React.StrictMode&gt;
        &lt;div id="cool-attribute"&gt;
          &lt;h1&gt;Welcome to the Jungle!&lt;/h1&gt;
          &lt;SearchParams /&gt;
        &lt;/div&gt;
      &lt;/React.StrictMode&gt;
    );
  };
  
  </code></pre>