New names (i.e., not in ISO 8879 list) do not clash with any existing ISO 8879 entity names. ISO 10646 character numbers are given for each character, in hex. values are decimal conversions of the ISO 10646 values and refer to the document character set. Names are Unicode names. --> <!--

There are no substantive changes in this document - only the integration of various errata. This document has been produced as part of the W3C HTML Activity. At the time of publication, the working group believed there were zero patent disclosures relevant to this specification.

Note: The HTML validator at http://w3.org does not complain when the xmlns attribute is missing in an XHTML document. This is because the namespace "xmlns=http://www.w3.org/1999/xhtml" is default, and will be added to the <html> tag even if you do not include it.

All HTML documents must start with a <!DOCTYPE> declaration. The declaration is not an HTML tag. It is an "information" to the browser about what document type to expect. In HTML 5, the declaration is simple: Tip: The <!DOCTYPE> declaration is NOT case sensitive.

The Web Standards Project is a grassroots coalition fighting for standards which ensure simple, affordable access to web technologies for all.

You can use this when you want to use HTML Frames to partition the browser window into two or more frames. If you want to use XHTML 1.0 Frameset DTD, then you need to include following line at the top of your XHTML document.

An XHTML DTD describes the allowed syntax and grammar of XHTML markup. Every XHTML document must start with a DTD declaration and a line of code that declares that you are starting to write XHTML code. This is the mandatory minimum way to start an XHTML document:

Yes, older browsers will work fine. The reason "<!DOCTYPE html>" was chosen in HTML 5 is because it is the smallest a doctype can be and yet still trigger standards compliance mode on those browsers you mention. Correct. However, there's one gotcha to be aware of.

Doctype, or document type declaration, tells the browser which version of HTML the page is written in and which Document Type Definition (DTD) it should use. It is required for proper rendering and standards compliance; older versions of Internet Explorer may behave unpredictably without it.

Bir belge türü beyanı için genel sözdizimi şöyledir: veya. XML'de, belgeyi temsil eden kök öğe, belgedeki ilk öğedir. Örneğin, XHTML'de, kök öğe <html> şeklindedir, açılan ilk öğedir (doctype beyanından sonra) ve son kapatılır.