Which programming language is CSS / HTML defined by?



How did the developers of HTML and CSS define them? I mean which programming language did they use?


Imagine i want to define a new HTML tag or new CSS property, or even a new language. for example instead of using tags <>, I want to define a language to use brackets [] and new CSS-resembling syntax:



[foo style(bar: .....)]


How they (developers) do this? and which programming language they use, which approach they follow?


p.s.1: I'm not going to develop a new language, it is just a question.


p.s.2: I couldn't find appropriate tags, so please be patient if this question doesn't fit css,html & xml contexts.


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