Possible Values
URL Specifies the location of the requested file.
#name Specifies the target anchor "#name".
Filename Specifies the name of a file in a network or local hard drive.
Other protocols You can use any of the following protocols in your href value:
afs:// AFS file access.
cid:// Content identifiers for MIME body part.
file:// Specifies the address of a file from the locally accessible drive.
ftp:// Uses Internet File Transfer Protocol (FTP) to retrieve a file.
http:// The most commonly used access method.
https:// Provide some level of security of transmission
mailto:// Opens an email program.
mid:// The message identifier for email.
news:// Usenet newsgroup.
x-exec:// Executable program.