title: Resizable frame emulation
body: <p>I understand that <code>&lt;frameset&gt;</code> and <code>&lt;frame&gt;</code> 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.</p>
  
  <p>I know that CSS3 has <code>resize</code> attribute, but that controls only the size of itself. I am not sure if this is to be used for the solution.</p>
  
  <p>I don't particularly prefer using JavaScript, but I am not excluding the possibility of using it if necessary.</p>