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HTML5 is the fifth and current major version of HTML (HyperText Markup Language), the standard markup language used to create web pages. It was finalized, and published, by the World Wide Web Consortium (W3C) in October 2014. HTML5 introduced a wide range of features and improvements designed to make web development more powerful and efficient.

Here are some key features of HTML5:

  1. Semantics: HTML5 introduced a range of new elements and attributes designed to better reflect the content being created, improving both accessibility and machine-readability. This includes tags like <header>, <footer>, <nav>, <section>, <article>, and <aside>.
  2. Connectivity: New APIs such as WebSocket enable more efficient communication between the client and the server, supporting more interactive real-time applications.
  3. Offline and storage: HTML5 includes features designed to help applications work even when the user is offline, including the ability to store data on the client side.
  4. Multimedia: HTML5 made it easier to embed audio and video into web pages with <audio> and <video> elements, reducing reliance on third-party plugins.
  5. Graphics and effects: It introduced the <canvas> element for immediate mode 2D drawing, and also added support for scalable vector graphics (SVG) content.
  6. Performance and integration: Features like Web Workers allow for background processing to be done in JavaScript, improving performance for complex applications.
  7. Device access: New APIs were added for interacting with device hardware, such as the Geolocation API for accessing GPS data.
  8. Styling: HTML5 is designed to work well with CSS3, giving developers more control over how their web pages look and behave.

In summary, HTML5 represents a significant leap forward in web development, making it easier for developers to create more sophisticated, interactive, and user-friendly web applications. As of my knowledge cutoff in September 2021, HTML5 is widely supported by all modern browsers.

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