Thread:Extension talk:HTMLets/Trouble relocating the htmlets directory/reply

Well, what do you mean by root - the file system root, or the document root? the URL above refers to the document root.

Anyway, unless you want to access htmlets on a different server, it's better to use an (absolute) file path instead of a URL, for example "/htmlets/" or some such. This would refer to the htmlets directory directly in the file system root.