Many years ago, I had some ad folks telling me that a 300x250 ad had
to show 1/3 above the fold (1024x768) to be sold as an
"above-the-fold" ad. It was some other fraction for a 160x600.
Either IAB.net doesn't have those details along with their other
specs, or I'm just not finding them.
Does anyone have a link to some kind of industry-wide accepted
standards or guidelines that answers the question: How much of the ad
has to show ATF before it can be sold as being ATF?