Similar to this question but not quite the same. What are people's thoughts about posting a jQuery solution as an answer to a question, when the question doesn't indicate jQuery, only Javascript?
My 2cents: post a Javascript solution or ask in the comments if jQuery is acceptable. I'm a fan of jQuery myself but I also enjoy coding in plain old Javascript, I think even more so now that jQuery has emerged because I feel like it's more of a niche. Seems that plain Javascript is becoming less used on SO and pretty much any DOM related question has a jQuery answer.