Explain the reason to not carry on extending HTML

Question

Explain the reason to not carry on extending HTML.

Answer 1

HTML was already overburdened along with dozens of interesting but incompatible inventions by different manufacturers, since it provides only one method of describing your information.

XML permits groups of people or organizations to question C.13, make their own customized markup applications for exchanging information within their domain (like music,  electronics, chemistry, hill-walking, surfing, finance, petroleum geology, cooking, linguistics, knitting, stellar cartography, engineering, history, rabbit-keeping, mathematics, question C.19 and genealogy).

HTML is here well beyond the limit of its usefulness as a manner of explaining information, and while this will continue to play a significant role for the content this currently represents, several new applications need a more flexible and robust infrastructure.