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WHATWG
Abbreviation for Web Hypertext Application Technology Working Group
In short and in plain language
The WHATWG is a group that writes rules for the web.
This includes the language that web pages are built in. Firms that make browsers work in the group.
The rules say how a browser should read and show a page.
Definition
The WHATWG is a working group that maintains the HTML standard and other foundations of the web. Makers of major browsers work together in it. Its standards describe how browsers should understand and display web pages.