Merge commit 'a024bc7d76fcc5e49e8210f9b0896db9ef21861a'

docs/assets/js/head-early.js

@@ -0,0 +1,16 @@
+import { scrollToActive } from 'js/helpers/index';
+
+(function () {
+	// Now we know that the browser has JS enabled.
+	document.documentElement.classList.remove('no-js');
+
+	// Add os-macos class to body if user is using macOS.
+	if (navigator.userAgent.indexOf('Mac') > -1) {
+		document.documentElement.classList.add('os-macos');
+	}
+
+	// Wait for the DOM to be ready.
+	document.addEventListener('DOMContentLoaded', function () {
+		scrollToActive('DOMContentLoaded');
+	});
+})();