 XHTML Benefits
XHTML documents are backward compatible with older,
non-XHTML compliant web browsers. Instead of sloppy HTML tags, your pages
will now contain XML tags that are always properly closed and nested
correctly, such as:
<p><b><u>This is some text<br /><br /></u></b></p>
Instead of:
<p><b><u>This is some text<br><br></b></u>
You can see that the XHTML version of the code above has a <p>, <b>, and
then a <u> tag. These tags are closed in the reverse order that they were
created in: </u>, </b>, and lastly </p>. All tags must be closed in this
way for the XHTML document to be considered valid.
Also, notice the <br /> tags? Because of the way non-XHTML browsers are
designed, as long as you leave a space between the beginning of the tag
and the “/>”, then they will just treat the tag normally, and ignore the
forward-slash.
XHTML is a standard
XHTML is an accepted standard (see
http://www.w3.org/TR/xhtml1/), meaning that all of the newer browsers
due for release in the future (such as newer version of IE, Netscape and
Opera) will most definitely contain built-in support for XHTML.
The first document type in the XHTML family is XHTML 1.0. The W3C standard
for XHTML takes three of the previous document types from HTML 4.0 and
converts them to fully utilize XML wherever possible. This promotes a
consistent, logical layout, while still keeping the actual content easy to
follow.
XHTML documents must incorporate one of three document type definitions
(DTD’s). This makes sure that the XML data contained within an XHTML
document is valid and conforms to a certain layout/logical style as
defined in that DTD file (more on DTD’s below).
You might be wondering what the benefits of migrating your current HTML
documents over to XHTML are; you may also be wondering why you should
bother learning more about XHTML; well, let me point out some of the
benefits of XHTML (as listed at
http://www.w3.org/TR/xhtml1/):
- XHTML documents are XML conforming. As such, they are readily
reviewed, edited and validated with standard XML tools such as the MSXML
parser.
- XHTML documents can be written to operate as well or better that
they did before in existing HTML 4-conforming user agents as well as in
new, XHTML 1.0 conforming user agents.
- XHTML documents can utilize applications (e.g. scripts and applets)
that rely upon either the HTML Document Object Model or the XML Document
Object Model (DOM)
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