frame is not showing the source at all

Question

Ok so I have the following frameset,

<frameset cols="30%,70%">

<frame src="left.html" />

<frameset rows="50%,50%">
<frame src="top.html" />
<frame src="bottom.html" />

</frameset>

</frameset>

but for some reason the files are not showing up!!! what am I doing wrong?!?!?! because I tested the code on http://www.w3schools.com/html/tryit.asp?filename=tryhtml_frame_mix and it works perfectly fine!!!!

Answer 1

Found the problem, I was placing it in the body, but it had to be placed under <header>