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Getting Started with FAST Element

License: MIT npm version

The fast-element library is a lightweight means to easily build performant, memory-efficient, standards-compliant Web Components. FAST Elements work in every major browser and can be used in combination with any front-end framework or even without a framework.


From NPM

To install the fast-element library, use either npm or yarn as follows:

npm install --save @microsoft/fast-element
yarn add @microsoft/fast-element

Within your JavaScript or TypeScript code, you can then import library APIs like this:

import { FASTElement } from '@microsoft/fast-element';

Looking for a setup that integrates with a particular front-end framework or bundler? Check out our integration docs.

From CDN

A pre-bundled script that contains all APIs needed to build web components with FAST Element is available on CDN. You can use this script by adding type="module" to the script element and then importing from the CDN.

<!DOCTYPE html>
<html lang="en">
<script type="module">
import { FASTElement } from "";

// your code here
<!-- ... -->

The markup above always references the latest release. When deploying to production, you will want to ship with a specific version. Here's an example of the markup for that:

<script type="module" src=""></script>

For simplicity, examples throughout the documentation will assume the library has been installed from NPM, but you can always replace the import location with the CDN URL.


Looking for a quick guide on building components? Check out our Cheat Sheet.