Good catch. Url changed from <a href="https:&#x2F;&#x2F;github.com&#x2F;paulirish&#x2F;The-cost-of-transpiling-es2015-in-2016" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;paulirish&#x2F;The-cost-of-transpiling-es2015-...</a>.