Placement positions value 0 means Unknown
The seller does not know, or does not report, where the slot renders.
When to send it
Send 0 when the slot's position cannot be determined at request time, for example a tag served into a cross-domain iframe that cannot measure its own location, or a server-to-server integration where the publisher never passed a position. It goes in Banner.pos for display slots and companion banners and in Video.pos for players. In practice 0 tells the buyer no more than an absent field does.
Buyers treat 0 as no information and fall back on their own viewability history for the domain, app or tag. It is most often confused with 3 (Below the Fold). A seller that knows a slot needs scrolling should say 3 rather than hide behind 0, and a seller that does not know should not guess 1.
Example
{
"imp": [
{
"banner": {
"pos": 0
}
}
]
}Fields that carry it
Other values in placement positions
| Value | Name |
|---|---|
1 | Above The Fold |
2 | Locked (fixed position) |
3 | Below The Fold |
4 | Header |
5 | Footer |
6 | Sidebar |
7 | Fullscreen |
8 | Partial Screen |
9 | Top Left |
10 | Top Right |
11 | Frame the content |
12 | Double box |
13 | Double box with background |
14 | Bottom Left |
15 | Bottom Right |
16 | L shape |
17 | Reversed L shape |
The placement positions list page explains the whole list and its common mistakes.