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Tag name should not contain spaces.
                    There should be no spaces between < and > in a tag.

                    Tags must be nested correctly.

                      HTML5 DOCUMENT STRUCTURE


                 An HTML document is a text file containing markup tags. The markup tags tell the Web browser how to
                 display various elements in the web page. An HTML file is saved with .htm or .html extension.

                 Basic Structure of HTML Document is as follows:

                 <!DOCTYPE html>
                 <html>
                 <head>

                 <title>Title of the web page</title>
                 </head>
                 <body>

                 Content of the page
                 </body>
                 </html>
                 An HTML page is divided into two sections called Head and Body.

                     Head contains the information about the document, such as the title of the page, links to stylesheets,
                   and other data that is not directly visible to the user on the web page.
                    Body contains the information which is to be shown on the web page.

                 HTML provides various tags such as <!DOCTYPE html>, <HTML>, <HEAD>, <TITLE>, <BODY>, and many
                 more. Let us discuss some tags in detail.

                 The <!DOCTYPE html> Tag

                 The  <!DOCTYPE  html>  is  not  an  element  in  HTML.  It  is  a  document  type  declaration  that  tells  the
                 browser about the version of HTML. It is not case sensitive which means you can write it into uppercase
                 or lowercase.

                 The <HTML> Tag

                 The <HTML> tag is the container for all other HTML elements. It tells the web browser that the text
                 contained between <html> and </html> is a web page and can be viewed using a web browser (Google
                 chrome, Microsoft Edge, Mozilla Firefox, etc.). Every web page coding must start with the <html> tag
                 and end with the </html> tag.
                 The <HEAD> Tag


                 The <Head> tag defines header area of your web page. The information given in <Head> tag tells the
                 computer that this information is not shown on the web page like document title, character set, styles,
                 scripts, and other information. It is a container tag used in pair as <head> and </head>. Every web page
                 coding must have its header tag.


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