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# jQuery
> jQuery is a fast, small, and feature-rich JavaScript library.
For information on how to get started and how to use jQuery, please see [jQuery's documentation](http://api.jquery.com/).
For source files and issues, please visit the [jQuery repo](https://github.com/jquery/jquery).
If upgrading, please see the [blog post for 3.4.1](https://blog.jquery.com/2019/05/01/jquery-3-4-1-triggering-focus-events-in-ie-and-finding-root-elements-in-ios-10/). This includes notable differences from the previous version and a more readable changelog.
## Including jQuery
Below are some of the most common ways to include jQuery.
### Browser
#### Script tag
```html
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
```
#### Babel
[Babel](http://babeljs.io/) is a next generation JavaScript compiler. One of the features is the ability to use ES6/ES2015 modules now, even though browsers do not yet support this feature natively.
```js
import $ from "jquery";
```
#### Browserify/Webpack
There are several ways to use [Browserify](http://browserify.org/) and [Webpack](https://webpack.github.io/). For more information on using these tools, please refer to the corresponding project's documention. In the script, including jQuery will usually look like this...
```js
var $ = require("jquery");
```
#### AMD (Asynchronous Module Definition)
AMD is a module format built for the browser. For more information, we recommend [require.js' documentation](http://requirejs.org/docs/whyamd.html).
```js
define(["jquery"], function($) {
});
```
### Node
To include jQuery in [Node](nodejs.org), first install with npm.
```sh
npm install jquery
```
For jQuery to work in Node, a window with a document is required. Since no such window exists natively in Node, one can be mocked by tools such as [jsdom](https://github.com/tmpvar/jsdom). This can be useful for testing purposes.
```js
require("jsdom").env("", function(err, window) {
if (err) {
console.error(err);
return;
}
var $ = require("jquery")(window);
});
```
Mini Shell