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Get started with Boosted, the world’s most popular framework for building responsive, mobile-first sites, with jsDelivr and a template starter page.

Quick start

Looking to quickly add Boosted to your project? Use jsDelivr, a free open source CDN. Using a package manager or need to download the source files? Head to the downloads page.


Copy-paste the stylesheet <link> into your <head> before all other stylesheets to load our CSS.

Boosted also provides Helvetica Neue fonts, limited to Orange brand usage: see NOTICE.txt for more information about Helvetica Neue license.

<!-- Copyright © 2014 Monotype Imaging Inc. All rights reserved -->
<link href="" rel="stylesheet" integrity="sha384-ARRzqgHDBP0PQzxQoJtvyNn7Q8QQYr0XT+RXUFEPkQqkTB6gi43ZiL035dKWdkZe" crossorigin="anonymous">
<link href="" rel="stylesheet" integrity="sha384-Di/KMIVcO9Z2MJO3EsrZebWTNrgJTrzEDwAplhM5XnCFQ1aDhRNWrp6CWvVcn00c" crossorigin="anonymous">


Many of our components require the use of JavaScript to function. Specifically, they require our own JavaScript plugins and Popper. Place one of the following <script>s near the end of your pages, right before the closing </body> tag, to enable them.


Include every Boosted JavaScript plugin and dependency with one of our two bundles. Both boosted.bundle.js and boosted.bundle.min.js include Popper for our tooltips and popovers. For more information about what’s included in Boosted, please see our contents section.

<script src="" integrity="sha384-5thbp4uNEqKgkl5m+rMBhqR+ZCs+3iAaLIghPWAgOv0VKvzGlYKR408MMbmCjmZF" crossorigin="anonymous"></script>


If you decide to go with the separate scripts solution, Popper must come first (if you’re using tooltips or popovers), and then our JavaScript plugins.

<script src="" integrity="sha384-7+zCNj/IqJ95wo16oMtfsKbZ9ccEh31eOz1HGyDuCQ6wgnyJNSYdrPa03rtR1zdB" crossorigin="anonymous"></script>
<script src="" integrity="sha384-mBRgv/ye1bG9U6wfppOiHvHVz1KlD7VdRcVZLfOCoQkohsL9P61pQxzobjI4XxNr" crossorigin="anonymous"></script>


If you use <script type="module">, please refer to our using Boosted as a module section.


Curious which components explicitly require our JavaScript and Popper? Click the show components link below. If you’re at all unsure about the general page structure, keep reading for an example page template.

Show components requiring JavaScript
  • Alerts for dismissing
  • Buttons for toggling states and checkbox/radio functionality
  • Carousel for all slide behaviors, controls, and indicators
  • Collapse for toggling visibility of content
  • Dropdowns for displaying and positioning (also requires Popper)
  • Modals for displaying, positioning, and scroll behavior
  • Navbar for extending our Collapse plugin to implement responsive behavior
  • Offcanvases for displaying, positioning, and scroll behavior
  • Toasts for displaying and dismissing
  • Tooltips and popovers for displaying and positioning (also requires Popper)
  • Scrollspy for scroll behavior and navigation updates

Required script

Boosted includes WICG’s :focus-visible polyfill to ensure an enhanced focus visibility for keyboard users while shutting down focus styles on active state. However, if you don’t need or want to use Boosted’s JavaScript files, you’ll still need to use the polyfill.

<script src="" integrity="sha384-xRa5B8rCDfdg0npZcxAh+RXswrbFk3g6dlHVeABeluN8EIwdyljz/LqJgc2R3KNA" crossorigin="anonymous"></script>

Starter template

Be sure to have your pages set up with the latest design and development standards. That means using an HTML5 doctype and including a viewport meta tag for proper responsive behaviors. Put it all together and your pages should look like this:

<!doctype html>
<html lang="en">
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- Preconnect to CDN: remove if not needed -->
    <link href="" rel="preconnect" crossorigin="anonymous">

      Neue Helvetica is a trademark of Monotype Imaging Inc. registered in the U.S.
      Patent and Trademark Office and may be registered in certain other jurisdictions.
      Copyright © 2014 Monotype Imaging Inc. All rights reserved.
      Orange has purchased the right to use Helvetica in its websites and mobile applications.
      If you are not authorized to used it, don't include the orangeHelvetica.css
      See NOTICE.txt for more information.
    <!-- Option 1: Use a CDN -->
    <link href="" rel="preload" as="font" type="font/woff2" integrity="sha384-R6e0PFLMMV6HBvkQK22ecNfjOzyh89wSndiTC71MuvoaOnhIYgOAGVC0gW0kVN16" crossorigin="anonymous">
    <link href="" rel="preload" as="font" type="font/woff2" integrity="sha384-ylOkwNNvSwXpWNbpEhI45ruJTXyfQbIb42IxMvSGGcndZBpZ9iAmOFSUl4/Goeqz" crossorigin="anonymous">
    <link href="" rel="stylesheet" integrity="sha384-ARRzqgHDBP0PQzxQoJtvyNn7Q8QQYr0XT+RXUFEPkQqkTB6gi43ZiL035dKWdkZe" crossorigin="anonymous">

    <!-- Option 2: Embed the fonts
    <link href="dist/fonts/HelvNeue55_W1G.woff2" rel="preload" as="font" type="font/woff2" crossorigin="anonymous">
    <link href="dist/fonts/HelvNeue75_W1G.woff2" rel="preload" as="font" type="font/woff2" crossorigin="anonymous">
    <link href="dist/css/orange-helvetica.min.css" rel="stylesheet" crossorigin="anonymous">

    <!-- Boosted CSS -->
    <link href="" rel="stylesheet" integrity="sha384-Di/KMIVcO9Z2MJO3EsrZebWTNrgJTrzEDwAplhM5XnCFQ1aDhRNWrp6CWvVcn00c" crossorigin="anonymous">

    <title>Hello, world!</title>
    <h1>Hello, world!</h1>

    <!-- Optional JavaScript; choose one of the two! -->

    <!-- Option 1: Boosted Bundle with Popper -->
    <script src="" integrity="sha384-5thbp4uNEqKgkl5m+rMBhqR+ZCs+3iAaLIghPWAgOv0VKvzGlYKR408MMbmCjmZF" crossorigin="anonymous"></script>

    <!-- Option 2: Separate Popper and Boosted JS
    <script src="" integrity="sha384-7+zCNj/IqJ95wo16oMtfsKbZ9ccEh31eOz1HGyDuCQ6wgnyJNSYdrPa03rtR1zdB" crossorigin="anonymous"></script>
    <script src="" integrity="sha384-mBRgv/ye1bG9U6wfppOiHvHVz1KlD7VdRcVZLfOCoQkohsL9P61pQxzobjI4XxNr" crossorigin="anonymous"></script>

For next steps, visit the Layout docs or our official examples to start laying out your site’s content and components.

Important globals

Boosted employs a handful of important global styles and settings that you’ll need to be aware of when using it, all of which are almost exclusively geared towards the normalization of cross browser styles. Let’s dive in.

HTML5 doctype

Boosted requires the use of the HTML5 doctype. Without it, you’ll see some funky incomplete styling, but including it shouldn’t cause any considerable hiccups.

<!doctype html>
<html lang="en">

Responsive meta tag

Boosted is developed mobile first, a strategy in which we optimize code for mobile devices first and then scale up components as necessary using CSS media queries. To ensure proper rendering and touch zooming for all devices, add the responsive viewport meta tag to your <head>.

<meta name="viewport" content="width=device-width, initial-scale=1">

You can see an example of this in action in the starter template.


For more straightforward sizing in CSS, we switch the global box-sizing value from content-box to border-box. This ensures padding does not affect the final computed width of an element, but it can cause problems with some third-party software like Google Maps and Google Custom Search Engine.

On the rare occasion you need to override it, use something like the following:

.selector-for-some-widget {
  box-sizing: content-box;

With the above snippet, nested elements—including generated content via ::before and ::after—will all inherit the specified box-sizing for that .selector-for-some-widget.

Learn more about box model and sizing at CSS Tricks.

Resource Hints

Resource hints are meant to optimize browser loading strategy, by either preloading assets, prefetching DNS or preconnecting to domains — but please use them carefully and only to hint resources you’ll really be using soon. It should be used for critical resources only.

preload fonts

<link rel="preload" href="dist/fonts/HelvNeue75_W1G.woff2" as="font" type="font/woff2" crossorigin="anonymous">
<link rel="preload" href="dist/fonts/HelvNeue55_W1G.woff2" as="font" type="font/woff2" crossorigin="anonymous">

preconnect to CDNs

<link rel="preconnect" href="" crossorigin="anonymous">


For improved cross-browser rendering, we use Reboot to correct inconsistencies across browsers and devices while providing slightly more opinionated resets to common HTML elements.