So,I was referring to the MDN web docs to learn about HTML, CSS, JS etc., but no version has been mentioned in the developer guides, for example within the HTML tutorial, even the HTML5 features/tags have been combined with HTML4 and older versions elements with no mention like these are new elements introduced in the latest version.
For your reference: https://developer.mozilla.org/en-US/docs/Web/HTML.
Also, even Angular official documentation website is being updated, but it’s so confusing which version of the concepts the angular.io is referring to in the https://angular.io/docs as the angular version is not mentioned.