What is HTML5?

HTML5 is a web development stack that defines the structure, properties, and characteristics of a web page content by adding a pattern that is mark-up based on it.

HTML5 is the fifth and more recent major release of HTML, and parts of XHTML. The present standard, the HTML Living Standard was developed by WHATWG, which is made up of the most popular vendors of browsers, for example, Google, Apple, Firefox, and Microsoft), with the Living Standard also existing in a version that is abridged.

HTML5 was initially released to the public-facing form on 22 January 2008, with a huge update and "W3C Recommendation" status in October 2014. The goals of HTML5 were to improve the language with full support for the latest multimedia, media’s and other new features; to make sure that the language remains both easily readable by humans and is consistently understood and interpreted by computers and devices such as web browsers, file parsers, etc., without the rigidity of XHTML and to remain compatible with more older software. HTML5 is developed to replace not only HTML 4, but also older version such as XHTML 1 and the DOM Level 2 HTML.

HTML5 comes with a very detailed processing model to further encourage more interoperable implementations of it, HTML5 extends, improves and rationalizes the mark up that are available for web documents, and it introduces application programming interfaces (API) and mark-ups for complex and dynamic web applications. For the same goals, HTML5 is also, a web technology for cross-platform mobile applications, because it is made up of features that are designed with low-powered devices and mobile devices in mind.

The HTML 5 syntax is no longer relied on SGML in spite of their mark-up being similar. HTML5 has, however, been developed to be able to work with older versions of HTML. HTML5 comes with a new first code line that looks very much like an SGML document type declaration, <!DOCTYPE html>, which initializes the HTML5 standards-compliant rendering mode.

Features of HTML5

There are many features of HTML5, below are some of them:

1. New Semantic Elements: HTML5 comes with new semantic mark-up elements such as <header>, <section>, and <footer>.

2. Forms 2.0: HTML 5 comes with a major improvements to the normal HTML web forms. New attributes have been introduced for the HTML <input> tag.

3. Persistent Local Storage: HTML5 now lets web developers to use local and web storage without depending on third-party plugins.

4. Web Socket: HTML5 comes with Web Socket which is a next-generation multi-directional communication technology for web applications.

5. Server-Sent Events: HTML5 comes with events that flow from a web server to the user's web browsers and they are known as Server-Sent Events (SSE).

6. Canvas: HTML5 canvas provides supports for a two-dimensional drawing surface that you can draw on with JavaScript.

7. Audio and Video: With HTML5, you can now embed audio or video to your webpages/web apps without depending on third-party plugins.

8. Geolocation: With HTML5, visitors to your websites can choose to share their physical location with your web application or not. 

9. Microdata: This feature of HTML5 lets you create your own semantic beyond what HTML5 offers you and it allows you to further extend your web pages with custom semantics.

10. Drag and drop: HTML5 allows you to drag and drop items from one location to the other in a webpage.

Benefits of HTML5

There are many benefits of HTML5, below are some of them:

1. HTML5 has a more cleaner mark-up and a more improved and readable code.

2. Elegant forms. 

3. Consistency.

4. HTML5 offers supports for rich media elements.

5. HTML5 lets you to implement offline Application Cache.

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