- Valid
- HTML
For a visitor friendly World Wide Web, the HTML markup validation is a must. Whatever your favorite HTML editor, whenever you are a novice or an experienced developer, you must follow rules to make a web site available for as many visitors as possible. The specifications defined by the World Wide Web Consortium (W3C) are mandatory:
If, for some reason, you prefer to stay with HTML 2, you must conform to the corresponding specification. The conformance to these rules, including the DOCTYPE declaration, is one of the first steps for optimising a Web site.
Do you need to adapt a DTD? DTD stands for the document type definition. Let's say the XHTML 1.0. Let's say that your particular public has special needs. Then, build your own DTD and conform with it. Do not forget to make your DTD available to Web browers in the DOCTYPE declaration
HTML and XHTML compliance
- For HTML development, the updated specifications are:
- HTML 4 revision 4.01, transitional or strict, [ http://www.w3.org/TR/html401/ }
- XML 1.0, Extensible Markup Language (XML) 1.0
- [ http://www.w3.org/TR/2006/REC-xml-20060816/ ]
- XML 1.1 [ http://www.w3.org/TR/2004/REC-xml11-20040204/ ]
- XHTML 1.0 Extensible HyperText Markup Language, a Reformulation of HTML 4 in XML 1.0
- [ http://www.w3.org/TR/xhtml1/ ]
Stylesheets specifications
- For the stylesheets,
- The CSS3 is under development
- The CSS2 Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification
- [http://www.w3.org/TR/CSS21/ ]
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The DOCTYPE declaration
Your HTML pages, static pages and dynamically generated as well, must include a DOCTYPE declaration, at the first position in the page, before the HTML declaration. The DOCTYPE indicates which specification of the World Wide Web Consortium you use. In other words, which standard you are intended to follow.
The validation process will check for errors and will tell you if the HTML is appropriate for your DOCTYPE declaration and if there are errors, so you may know what to modify.
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Going further
We offer a DOCTYPE and META data examples in our free i-Meta Manager help page.
There are many other important points for a valid document, in particular the link validation.
We offer an extended list of validation tools, for HTML markup validation, for CSS validation, for link validation, as well as XML validators and sitemaps validators, or accessibility validators.
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