WebVR libaries.
Just drop these scripts into your page:
<script src="https://mozvr.com/webvr-libs/webvr-polyfill.js"></script>
<script src="https://mozvr.com/webvr-libs/VRControls.js"></script>
<script src="https://mozvr.com/webvr-libs/VREffect.js"></script>
First, make sure you've installed the Node dependencies:
npm i
Then, to fetch the latest versions of the libraries:
npm sync