I understand that <frameset> and <frame> tag are becoming deprecated. Is there a way to emulate resizable frames? What I want is a narrow separator separating the area either horizontally or vertically, which is movable by the user so that when one side of it becomes smaller, the other side becomes larger, and vice versa. I do not want to fill in each frame with an html page like the conventional frame, but instead with some DOM materials.
I know that CSS3 has resize attribute, but that controls only the size of itself. I am not sure if this is to be used for the solution.
I don't particularly prefer using JavaScript, but I am not excluding the possibility of using it if necessary.
Answer
Do not use frameset, please. I don't think jQuery resize will help you much, either.
The best way to do this is by using a "splitter". There are several plugins for jquery that will do this in many different way and they all are actually quite simple.
I have previously used this one: http://methvin.com/splitter/
You can find a nice demo here: http://methvin.com/splitter/3psplitter.html