HTML5 is a language for creating and dispaly content for the World wide Web, It is the revised html standard. It main aims have been to enhance the language with the support for the latest multimedia while keeping it easily readable by humans and consistently understood by computers and devices.
HTML5 is a response to the observation that the HTML and XHTML in common use on the World Wide Web is a mixture of features introduced by various specifications, along with those introduced by software products such as web browsers, those established by common practice, and the many syntax errors in existing web documents. It is also an attempt to define a single markup language that can be written in either HTML or XHTML syntax. It includes detailed processing models to encourage more interoperable implementations; it extends, improves and rationalises the markup available for documents, and introduces markup and application programming interfaces (API)s for complex web applications.
In particular, HTML5 adds many new syntactical features. These include the <video>, <audio>, <header> and <canvas> elements, as well as the integration of SVG content. These features are designed to make it easy to include and handle multimedia and graphical content on the web without having to resort to proprietary plugins and APIs. Other new elements, such as <section>, <article>, <header>, and <nav>, are designed to enrich the semantic content of documents. New attributes have been introduced for the same purpose, while some elements and attributes have been removed. Some elements, such as <a>, <cite> and <menu> have been changed, redefined or standardized. The APIs and document object model (DOM) are no longer afterthoughts, but are fundamental parts of the HTML5 specification. HTML5 also defines in some detail the required processing for invalid documents, so that syntax errors will be treated uniformly by all conforming browsers and other user agents.
Advantages of Html5
HTML5 allows to play audio and video without installing third party plug-in such as flash
With HTML5 we can use the new structural elements instead of traditional div tags to create page template, the final result will be a cleaner and more organized code.
Client Side Storage
HTML5 allows to store data locally from client side. The data can be accessed to support the web application and it can even be accessed when the client is disconnected for a short period of time.
Client-side storage is divided into 3 methodologies: session storage, local storage and database storage.
Reduces Development Costs
HTML5 introduces new elements and features that allow developers to improve interoperability, handling elements in a precise way saving time and costs.
Great for Mobile Devices
HTML5 could be the solution to faster applications that will be accessible universally across all mobile phones.
The Geolocation API
New form types and elements will help you certify that the information entered online is completely accurate. There won’t be any need to run additional scripts for checking validation. This speeds up the loading time and the user experience will be enhanced.