Supporting IE

If you are building a website, you might want to support IE 11+. This support is not added by default to your website. Quasar CLI provides it on demand only.

Attention Windows Developer

It is strongly recommended to use Yarn instead of NPM when developing on a Windows machine, to avoid many problems.

Installation of IE Support

In order to support IE, you’ll need to edit /quasar.conf.js:

module.exports = function (ctx) {
  return {
    supportIE: true,

That’s it. This will inject the Promise polyfill, along with some other smaller polyfills, adding an extra ~6k worth of code (minified) to your bundle.

IE Polyfills

Quasar CLI is smart enough to include the IE polyfills only if it is really needed. An Electron app for example doesn’t need it and as a result, even if you leave supportIE set to “true” in quasar.conf.js it won’t be bundled.


Running dev server on a Windows machine and consuming the output in IE11 might result in an error (ansi-strip package related used by webpack-dev-server). This is why you might need to keep the strict dependency "strip-ansi": "=3.0.1" in your package.json (use yarn and pin this version).

UMD IE11 support

If you are developing for UMD and want IE 11 support you will need to add the following HTML tag before the Vue and Quasar tags:

<!-- replace "1.0.0" with your version of Quasar -->
<script src=""></script>

What does it do?

You can check out what enabling the IE11 support means on Github (what polyfills are injected and the needed CSS fixes).