html - links without http protocol

Question

Is there a reason we include the http / https protocol on the href attribute of links?

Would it be fine to just leave it off:<

Answer 1

URLs in href are not restricted to only HTTP documents. They support all the protocols supported by browsers- ftp, mailto, file etc.

Also, you can preceed URL name with '#', to link to a html id internally in the page. You can give just the name or directory path, without a protocol, which will be taken as a relative URL.