You can edit it directly or open it in a new tab by pressing the “Fork” button in the upper right corner.
Most pages in the React documentation contain sandboxes like this. Outside of the React documentation, there are many online sandboxes that support React: for example, CodeSandbox, StackBlitz, or CodePen.
Try React locally
To try React locally on your computer, download this HTML page. Open it in your editor and in your browser!
Start a new React project
If you want to build an app or a website fully with React, start a new React project.
Add React to an existing project
If want to try using React in your existing app or a website, add React to an existing project.
Next steps
Head to the Quick Start guide for a tour of the most important React concepts you will encounter every day.