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  There are several platforms similar to CodePen that allow you to view the code for complete projects or webpages. Some of the most popular options include: JSFiddle - This is a popular platform that allows you to write, edit, and collaborate on HTML, CSS, and JavaScript code. You can also view and test your code in real-time, and share your projects with others. CodeSandbox - This is a powerful online editor that allows you to build and test entire web applications using HTML, CSS, and JavaScript. You can also collaborate with others, preview your projects in real-time, and deploy your applications to a variety of hosting platforms. JS Bin - This is another popular online code editor that allows you to write, test, and share HTML, CSS, and JavaScript code snippets. You can also save your projects, collaborate with others, and embed your code snippets on other websites. Repl.it - This is an online coding platform that allows you to write, test, and deploy web applications using a ...

  React is a JavaScript library for building user interfaces. It allows developers to create dynamic and responsive UI components that can update efficiently and quickly without needing to reload the entire page. React works by using a virtual DOM (Document Object Model) to update the UI in response to changes in data or user interactions. When working with React, developers write components using a combination of JavaScript, HTML-like JSX syntax, and CSS. JSX is a syntax extension for JavaScript that allows developers to write HTML-like markup directly in their JavaScript code. This allows for a more declarative and intuitive way to build UI components. React components can be thought of as individual building blocks that make up the UI. Each component is responsible for rendering a specific piece of the UI, and can be reused across different pages or applications. Components can be created using functions or classes, and can accept props (short for properties) which allow them to...