Learn HTML Code Tutorial Reference Guideback to <A TARGET="_self">
If you follow the link in the frame to the right, the page it goes to will appear in that same frame. This was done using the attribute: 

go to <A HREF="selftarget.html" TARGET="_self">next</A> page

However, because is the default value, you can accomplish the same thing leaving out the TARGET attribute: 

go to <A HREF="selftarget.html">next</A> page