Illustration of Fixed Block Element Height

Here is the outer div -- And now for the
second div:
Overflow: visible; .
Any overflow past the bottom of this box overflows and is displayed, possibly obscuring any subsequent text.
And now for the
third div:
Overflow: auto;.
With value "auto" the browser automatically adds scroll bars if necessary - and leaves them out if they are not necessary.
And now for the
fourth div:
Overflow: scroll.
You get scrollbars regardless of the need for them!
Wasn't that fun!