No, it's part of webkit/blink/gecko, it's not part of JS. But that's not why I exclude textarea: I exclude textarea for the same reason dictionaries define som

No, it's part of webkit/blink/gecko, it's not part of JS. But that's not why I exclude textarea: I exclude textarea for the same reason dictionaries define something without using the same word and base form. And the argument is generally meaningless: You may just as well call emacs and say you are using "the operating system's high level functionality".