HTML and CSS Reference
In-Depth Information
Unlike with the anchor element, a browser does not indicate the linked sub-
areas of an image. he map and area elements are explained in the section
“Inline Images.”
uniForM rESourCE LoCATorS
he URL format permits almost any resource on the Internet to be addressed,
whether that resource is an HTML ile on a web server or another Internet
resource, such as a ile on an FTP server. he URL has several parts, not all
of which are required for the URL to be valid. In order of appearance, they
specify the following:
1 he protocol method to be used to access the resource
2 A username if the resource requires authentication
3 he hostname of the server providing the resource
4 A port number to be used on the server
5 he directory path to the resource
6 he ilename of the resource
7 he anchor name or ID of an element in the HTML document
8 Parameters to be passed to the resource
Various delimiters separate the parts, as follows:
protocol :// username @ hostname : port / path / filename # anchor ? parameters
he method for accessing resources on ordinary web servers is http , which
stands for Hypertext Transport Protocol. Secure web servers are accessed with
the https method. Other protocol methods access Internet services other than
the Web.
he ile protocol method is used to access resources on the local computer.
his is the implied protocol when using the Open command on the browser's
File menu. he username, hostname, and port parts of the URL are not used
with the ile protocol. he ile protocol method should never be used in a web
page on a remote web server.
he mailto protocol method signals that the browser should open a new
message in the user's email client. he recipient's email address comes imme-
diately ater the colon (:) following the protocol. For example:
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