Creating four frames using HTML
===

I need to create four frames in an HTML document. The code below creates only three frames.

    <!DOCTYPE html>
    <html>
    <FRAMESET cols="100%" rows="10%,90%" >
      <FRAMESET rows="100%,">
          <FRAME src="frame_a.htm">
      </FRAMESET>
      <FRAMESET cols="20%,60%" rows="40%,80">
          <FRAME src="frame_b.htm">
          <FRAME src="frame_c.htm">
      </FRAMESET>
      <FRAMESET rows="60%," >
          <FRAME src="frame_d.htm">
      </FRAMESET>
    
    </FRAMESET>
    </html>

This snapshot explains the explains the question. Notice that the above code didn't create frame D. Thanks
![enter image description here][1]


  [1]: http://i.stack.imgur.com/si6k9.png