With respect to “context”, most likely all of the textual data (ASCII chars, or whatever; e.g., uni-code gobbledygook) produced by a web browser for display on a terminal is run through a parser, within such said web browser, and in probably all cases that parser uses a context-free grammar. So, technically, in most cases, all comments here may be considered context free (at least in one context). However, those who may also add additional context-free-ness of their own (atop of that provided by the browser), may be considered at least doubly context free.