Modern browsers discern the type of documents being loaded; thus, it is necessary to tag pages with their appropriate types. While at it, let’s take a look at basic layout of an HTML file. No further explanations are necessary.

<!DOCTYPE html>
<html>
  <head>
    <!-- metadata elements linkmetatitle, and style -->
  </head>
  <body>
   <!-- page contents tr, td, h1h2div, pa, etc-->
  </body>
</html>