Do protocol relative urls work cross-platform?

I often use the // relative URI hack. Example:Mostly because of this post: Is it valid to replace http:// with // in a ?.However, a guy I am working with on a project says this doesn’t work on Mac (Chrome, Firefox, and Safari) or iDevices.Not having a Mac or said devices, I can’t verify it, and it works fine on …

via HTML Language Development » Search Results » ajax:

Do protocol relative urls work cross-platform?

I often use the // relative URI hack. Example:
Mostly because of this post: Is it valid to replace http:// with // in a