View source to see that the browser normally gets HTML, text, and white space used in formatting code.

WHAT KIND OF DAY IS TODAY?
Today, 30-Jul-10, is an even day. This is example number 1

The cfsetting tag with enablecfoutputonly set to yes blocks everything that ColdFusion didn't generate. This includes the text heading "WHAT KIND...". The output of cfoutput tags runs together seamlessly. The output of writeOutput() in a cfscript tag isn't quite as seamless, and the javascript ColdFusion generated for the dummy form appears as it normally does.

Today, 30-Jul-10, is an even day.This is example number 2!

This time, the cfsilent tag has blocked all output, even text inside of a cfoutput tag. The example known as number 3 does not appear.

Just as a reminder that the odd/even logic could have been handled by a single function, look here.

Today, 30-Jul-10, is an even day. This is example number 4

Finally, notice that the debug output many of you have configured your enviroment to display does not appear. It has been blocked by the cfsetting tag with showdebugoutput set to "no".