cyberdelia/django-pipeline — comment on commit 5072bbebd0629b0f772921b279b733d8802a8c67
File: compress/compressors/__init__.py line 44
By cyberdelia:

Because url starting with ```// ``` are protocol relative urls that lets the browser decide between https or http see for example : http://blog.wikimedia.org/2011/07/19/protocol-relative-urls-enabled-on-test-wikipedia-org/