These (along with Kleenex) are common examples of genericization, yet I assume through diligence on the part of those brands, I hear and see the actual generic terms used far more frequently. For example, I've never heard anyone under the age of 70 (by now) use "Nintendo" to mean any video game console. "Sticky note", "photocopy", and "tissue" are terms I personally hear used much more frequently than "Post-it", "Xerox", or "Kleenex", respectively.
But for "JavaScript"? What else is there? "JS"?
Edit: I guess there's "ECMAScript", but who actually says that (aside when they legally need to)?
I've only heard Xerox be used like that once in my life. I was so confused what a company that invented the mouse had to do with what the person was talking about.
But for "JavaScript"? What else is there? "JS"?
Edit: I guess there's "ECMAScript", but who actually says that (aside when they legally need to)?