Following the XHTML Path
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The main difference between HTML and XHTML is the structure of XHTML. XHTML is a more formalized structure of HTML 4.0 supporting all HTML 4.0 features with complete CSS and DOM support. The formalized style of XHTML coding allows ease of maintenance and future additions to any XHTML Web page or site. Loose and unstructured elements are not allowed in XHTML. For example, in XHTML you must use lower case tags for all HTML attributes and elements:
Now is the time to double check your HTML editor. Most current
HTML editors have support for XHTML. Be sure to get the latest
updates and version of your HTML editor. If your editor does
support XHTML, then be certain to review all documentation and
suggestions on the XHTML functions. Practice converting your Web
pages from HTML to XHTML. Be sure to check your XHTML by
submitting your Web page to the W3C XHTML Validator.
(validator.w3.org) The validator will verify that your
Web page follows all XHTML guidelines and will parse correctly.