This single command downloads the Playwright NPM package and browser binaries for Chromium, Firefox and WebKit. To modify this behavior see [installation parameters](./installation.md).
## Usage
Once installed, you can `require` Playwright in a Node.js script, and launch any of the 3 browsers (`chromium`, `firefox` and `webkit`).
```js
const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
// Create pages, interact with UI elements, assert values
await browser.close();
})();
```
Playwright APIs are asynchronous and return Promise objects. Our code examples use [the async/await pattern](https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Asynchronous/Async_await) to ease readability. The code is wrapped in an unnamed async arrow function which is invoking itself.
```js
(async () => { // Start of async arrow function
// Function code
// ...
})(); // End of the function and () to invoke itself
```
## First script
In our first script, we will navigate to `whatsmyuseragent.org` and take a screenshot in WebKit.
By default, Playwright runs the browsers in headless mode. To see the browser UI, pass the `headless: false` flag while launching the browser. You can also use `slowMo` to slow down execution. Learn more in the debugging tools [section](./debug.md).
Playwright includes built-in support for TypeScript. Type definitions will be imported automatically. It is recommended to use type-checking to improve the IDE experience.
### In JavaScript
Add the following to the top of your JavaScript file to get type-checking in VS Code or WebStorm.
```js
//@ts-check
// ...
```
Alternatively, you can use JSDoc to set types for variables.
```js
/** @type {import('playwright').Page} */
let page;
```
### In TypeScript
TypeScript support will work out-of-the-box. Types can also be imported explicitly.
