Why we use <!DOCTYPE html>
use of doc type in html is as following!!!
Definition and Usage
The <!DOCTYPE> declaration must be the very first thing in your HTML document, before the <html> tag.
The <!DOCTYPE> declaration is not an HTML tag/element; it is an instruction to the web browser about what version of HTML the page is written in.
In HTML 4.01, the <!DOCTYPE> declaration refers to a DTD, because HTML 4.01 was based on SGML. The DTD specifies the rules for the markup language, so that the browsers render the content correctly.
HTML5 is not based on SGML, and therefore does not require a reference to a DTD.
Tip: Always add the <!DOCTYPE> declaration to your HTML documents, so that the browser knows what type of document to expect.
We use it Because there have been several versions of HTML, each web page should begin with a DOCTYPE declaration to tell a browser which version of HTML the page is using (although browsers usually display the page even if it is not included). We will therefore be including one in each example for the rest of the book. As you will see when we come to look at CSS and its box model on page 316, the use of a DOCTYPE can also help the browser to render a page correctly. Because XHTML was written in XML, you will sometimes see pages that use the XHTML strict DOCTYPE start with the optional XML declaration. Where this is used, it should be the first thing in a document. There must be nothing before it, not even a space.
Example
<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
The content of the document......
</body>
</html>
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