Hyper-Text Markup Language or HTML is a document format that specifies the layout of a webpage. HTML5 is the latest spec approved in 2008.
Hello World
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Hello World</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>- A Simple Hello World in HTML5