Why isn't the Material UI icon appearing on the React app when viewed through a browser?

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There could be several reasons why the Material UI icon is not appearing on the React app when viewed through a browser:

1. Incorrect installation: Make sure that Material UI is installed properly by running the "npm install @material-ui/core" command in the terminal. Also, ensure that the icon package "@material-ui/icons" is installed.

2. Incorrect import statement: Make sure that the icon is imported correctly using the import statement "@material-ui/icons/IconName", where IconName is the name of the icon you want to use.

3. Component not rendered: Make sure that the icon component is rendered on the page by including it in the JSX code. Also, check that the icon is not hidden by any CSS styles or positioned off-screen.

4. Browser cache: Sometimes, the browser may cache old versions of the app, including the icon. Clear the browser cache and refresh the page to see if the icon appears.

5. Server-side rendering: If the React app is using server-side rendering, make sure that the icon is loaded on the server-side as well.