Avoid rendering issues from async loading

We want pages which render quickly, smoothly, and securely. Techniques
which disrupt a smooth rendering process should be avoided.

best-practices/README.md

@@ -191,6 +191,13 @@ Email
 [MailView]: https://github.com/37signals/mail_view
 [ActionMailer Preview]: http://api.rubyonrails.org/v4.1.0/classes/ActionMailer/Base.html#class-ActionMailer::Base-label-Previewing+emails
 
+Web
+---
+
+* Avoid a Flash of Unstyled Text, even when no cache is available.
+* Avoid rendering delays caused by synchronous loading.
+* Use https instead of http when linking to assets.
+
 JavaScript
 ----------
 * Use Coffeescript, ES6 with [babel], or another language that compiles to