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HTML-5 Declaration - lt! DOCTYPE htmlgt
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• Definition lt!DOCTYPEgt Defines the Document type
  , ! stands for Exclamation mark and
  DOCTYPE stands for Document type.
• Description The HTML document type declaration
  is 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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Supporting Browsers

• All the modern browsers like Firefox, Internet
  Explorer, Chrome, Safari, and Opera supports html
  5 doctype.

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Syntax

• In HTML 5, the declaration is lt!DOCTYPE htmlgt
• In HTML 4, the declaration is
• lt!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01
  Transitional//EN" "http//www.w3.org/TR/html4/str
  ict.dtd"gt 
• As you can see the syntax, the DOCTYPE for HTML5
  is rather the most shortest declaration compared
  to HTML4 or other XHTML declarations due to lack
  of references to a DTD like we usually have a DTD
  URL as an attribute.

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Case sensitive

• lt!DOCTYPE htmlgt Declaration is NOT case
  sensitive
• We can write any format like
• My suggestion is to use UPPERCASE

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Writing code of HTML-4

• For writing a code to start with first line
  as shown below  

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Writing code of HTML-5

• For writing a code to start with first line
  as shown below  

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EXPLANATION

• A DOCTYPE declaration appears at the top of a
  web page before all other elements. According to
  the HTML specification or standards, every HTML
  document requires a valid document type
  declaration to insure that your web pages are
  displayed the way they are intended to be
  displayed 
• The doctype declaration is usually the very first
  thing defined in an HTML document (even before
  the opening lthtmlgt tag) however the doctype
  declaration itself is not an HTML tag. 
• If you don't use a doctype in the starting of an
  HTML document, the browser goes to the quirky
  mode. In that case, you may find that certain
  content is not being displayed the way you marked
  them up. So, it is a good practice to start your
  HTML document with a doctype

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• In the version, HTML 4.01, the usage of DOCTYPE
  declaration was to create a reference to a
  document type definition (DTD), since the version
  HTML 4.01 was completely based on a Standard
  Generalized Markup Language (SGML).
• The document type definition (DTD) is responsible
  for specifying the rules for the Standard
  Generalized Markup Language(SGML) so that the
  browser processes the content correctly.
• In HTML 5 there isnt any need for a reference
  to a document type definition (DTD) because HTML
  5 is not based on a Standard Generalized Markup
  Language(SGML).

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