While browsing online today, I came across the following URL:
Somehow it works. In Firefox 3.6/Mac, the browser seems to interpret the URL as:
In Safari 5/Mac, the URL does not change when I navigate to it.
Thus, only alphanumerics, the special characters "$-_.+!*'(),", and reserved characters used for their reserved purposes may be used unencoded within a URL.
Is this an oddity of character encoding? And, how/where can I register my own § URL?