HTML5 is the most versatile and easy-to-use web technology in the modern world. Most of it has been constructed in Web Hypertext Application Technology Working Group (WHATWG). The World Wide Web's markup language has always been HTML. HTML was mainly created to make web development an easy task. Besides, the general design and adaptations have made it possible to utilize HTML to define a number of documents. The area of concern that's been occasionally addressed by HTML is ambiguous and is referred to as Web Application Development. This HTML specification attempts to improve web application development structure. In this specification, the ability to update HTML references in order to address issues regarding web compatibility has also been enhanced.