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Doctype page headers
The doctype tag tells the browser what standard the page conforms to. Until
now doctypes did not have to be including but with the creation of XHMTL 1.0,
they must know be put in. Doctype tags go above your head tag. There are 3 types
of doctype tags. Strict, transitional and frameset.
If anything this short article is for reference. Its one for you t quickly
pop allong and cut and paste from into your page. But then again there is little
to explain about Doctypes. They have been around for a while although they were
not required until the creation on XHTML 1.0. And now your page will also display
differently depending on what Doctype you use now that they actually have meaning.
So make sure you pick the correct one. If your page isn't XHTML complient then
add in a HTML 4.1 Doctype. Although converting your page to XHTML is a much
better option.
Strict
Strict is the hardest standard to compy with. If you add a strict doctype to
your document, you cannot use many tags such as <font>. Very few websites
use strict doctypes.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
Transitional
This is the most commonly used doctype as it allows you to keep some of the
old tags but still lets you move on to XHTML.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Frameset
This is for frameset pages (well pretty obvious really).
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
Source: Worfolk Developers Library
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