The goal of DOCTYPE html is to provide programmers and browsers with information at first glance of the Document Type Definition (DTD) and how a website should be rendered. The DTD indicates which code language is used on the page or in the HTML document. This applies, for example, to files in HTML, XHTML, SVG, MathML, or XML.
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DOCTYPE is a declaration that tells the browser how to interpret the HTML document. It is important to use the correct DOCTYPE for different versions of HTML. Learn more about the meaning and syntax of DOCTYPE in HTML at GeeksforGeeks, a portal for computer science enthusiasts.
The HTML document type declaration, also known as DOCTYPE, is the first line of code required in every HTML or XHTML document. The DOCTYPE declaration is an instruction to the web browser about what version of HTML the page is written in. This ensures that the web page is parsed the same way by different web browsers.
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A document type declaration, or DOCTYPE, is an instruction that associates a particular XML or SGML document (for example, a web page) with a document type definition (DTD) (for example, the formal definition of a particular version of HTML 2.0 - 4.0). In the serialized form of the document, it manifests as a short string of markup that conforms to a particular syntax.
DOCTYPE HTML PUBLIC
The HTML !doctype tag is used for specifying which version of HTML the document is using. This is referred to as the document type declaration (DTD).. The HTML 4 document type declaration starts off with 
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The doctype declaration refers to a Document Type Definition (DTD). The DTD specifies the rules for the markup language, so that the browsers render the content correctly. A Doctype declaration triggers standards mode in your browser and should always be used. Quirks mode should always be avoided.
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6 Answers Sorted by: 54 Traditionally, a Doctype, or Document Type Declaration associates the document with a Document Type Definition. The Document Type Definition is a standard for a specific XML or SGML document.
What Is Doctype In HTML5? Which Doctype Is Correct For HTML5
In HTML 4.01, this declaration refers to a Document Type Definition (DTD), which specifies the structure and the legal elements of an XML document. The is declared before the tag. The declaration is not case sensitive. Syntax [Root element] [Publicity] " [Registration] // [Organization] // [Type] [Name] // [Language] " " [URL] ">
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The simplest and most reliable doctype declaration to use is the one defined in HTML5: If you need a doctype matching a specific version of (X)HTML, the doctype declaration must be exact (both in spelling and in case) to have the desired effect, which makes it sometimes difficult.
The HTML !DOCTYPE tag is the very first thing that every compliant web document should have. It's purpose is to inform the browser the type of document it's about to process. In HTML5, the !DOCTYPE declaration remains only for legacy reasons pertaining processing modes in browsers. The Document Type Declaration (DTD) is unique for each version.
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This HTML tutorial explains how to use the HTML element called the !DOCTYPE tag with syntax and examples. The HTML !DOCTYPE tag tells the browser what version of HTML the document is written so that the browser knows what to expect (also called !DOCTYPE element).
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Now, that may look like a lot of nonsense to you, so let me offer a somewhat simplified explanation of how it is constructed. For a much more detailed look at exactly what each character refers to, see the article !DOCTYPE .
Doctype html public
8 Answers Sorted by: 79 Basically, the DOCTYPE describes the HTML that will be used in your page. Browsers also use the DOCTYPE to determine how to render a page. Not including a DOCTYPE or including an incorrect one can trigger quirks mode.
Document Type Declaration or DOCTYPE declares which version of HTML is being followed by the document in question. Each version of HTML has its own set of rules, exclusions and inclusions. If an HTML document follows the rules specified in a particular version of HTML, then it is called valid HTML document.
All HTML documents must start with a declaration. The declaration is not an HTML tag. It is an "information" to the browser about what document type to expect. In HTML5, the declaration is simple: . In older documents (HTML 4 or XHTML), the declaration is more complicated because the declaration must refer.
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