| Cadkiller 2006-09-12, 10:48 pm |
| Group;
I'm trying to validate my website at www.W3.org and I get a doctype error.
They seem to show several different doctypes that I can use.
I'm just not sure which doctype to use, how to add this doctype to my web
site and where to place it on my web site?
I have copied the W3.org doctype page for your info.
Any help would be greatly appreciated.
Choosing a DOCTYPE
According to HTML standards, each HTML document requires a document type
declaration. The "DOCTYPE" begins the HTML document and tells a validator
which version of HTML to use in checking the document's syntax.
If standard HTML does not meet your needs but you still wish to gain the
benefits of HTML validation, see the section on using a custom DTD.
The following DOCTYPEs are commonly used:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
This declares the document to be HTML 4.01 Strict. HTML 4.01 Strict is a
trimmed down version of HTML 4.01 that emphasizes structure over
presentation. Deprecated elements and attributes (including most
presentational attributes), frames, and link targets are not allowed in HTML
4 Strict. By writing to HTML 4 Strict, authors can achieve accessible,
structurally rich documents that easily adapt to style sheets and different
browsing situations. However, HTML 4 Strict documents may look bland on very
old browsers that lack support for style sheets.
Newer browsers such as Internet Explorer 5 for Mac, Netscape 6, and Mozilla
use a standards-compliant rendering for HTML 4 Strict documents. These
browsers use a "quirks" mode for most other document types to emulate
rendering bugs in older browsers.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
This declares the document to be HTML 4.01 Transitional. HTML 4 Transitional
includes all elements and attributes of HTML 4 Strict but adds presentational
attributes, deprecated elements, and link targets.
Newer browsers such as Internet Explorer 5 for Mac, Netscape 6, and Mozilla
use a standards-compliant rendering for HTML 4.01 Transitional documents that
include the URI of the DTD in the DOCTYPE. These browsers use a "quirks" mode
to emulate rendering bugs in older browsers if the URI is omitted:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"
"http://www.w3.org/TR/html4/frameset.dtd">
This declares the document to be HTML 4.01 Frameset. HTML 4 Frameset is a
variant of HTML 4 Transitional for documents that use frames.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
This declares the document to be XHTML 1.0 Strict. XHTML 1.0 Strict is an
XML version of HTML 4 Strict.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
This declares the document to be XHTML 1.0 Transitional. XHTML 1.0
Transitional is an XML version of HTML 4 Transitional.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
This declares the document to be XHTML 1.0 Frameset. XHTML 1.0 Frameset is
an XML version of HTML 4 Frameset.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
This declares the document to be HTML 3.2. HTML 3.2 is well supported by
most browsers in use. However, HTML 3.2 has limited support for style sheets
and no support for HTML 4 features such as frames and internationalization.
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
This declares the document to be HTML 2.0. HTML 2.0 is widely supported by
browsers but lacks support for tables, frames, and internationalization, as
well as many commonly used presentational elements and attributes.
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