> For the complete documentation index, see [llms.txt](https://docs.relevant-digital.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.relevant-digital.com/technical/integration/formats-and-channels/set-up-google-oop-format.md).

# Set up Google OOP format

Use this pattern to define selected Google Ad Manager placements as out-of-page slots.

The callback replaces `googletag.defineSlot()` with `googletag.defineOutOfPageSlot()` for matching slots.

### Before you start

Add an identifying attribute to each slot that should use an out-of-page format. This example uses `data-dfp-oop`.

The implementation overrides the Google slot definition during `onBeforeAuctionSetup`.

{% hint style="info" %}
Use this pattern only with Google Ad Manager placements.
{% endhint %}

### Implementation

Register the callback before loading ads:

{% code title="out-of-page-slot.js" %}

```javascript
relevantDigital.addAuctionCallbacks({
    onBeforeAuctionSetup: ({ auction }) => {
        auction.googletagCalls = auction.googletagCalls || {};
        auction.googletagCalls.defineSlot = (adUnitPath, size, div) => {
            const element = document.getElementById(div);
            const format = element?.getAttribute('data-dfp-oop');

            if (format === 'outOfPage' || format === 'homepageOutOfPage') {
                return googletag.defineOutOfPageSlot(adUnitPath, div);
            }

            return googletag.defineSlot(adUnitPath, size, div);
        };
    },
});
```

{% endcode %}

### How it works

1. `onBeforeAuctionSetup` runs before the auction starts.
2. The callback overrides the auction’s `defineSlot` function.
3. The override reads `data-dfp-oop` from the slot element.
4. Matching values create an out-of-page slot. All other slots use the standard definition.

### Related API references

* [relevantDigital.addAuctionCallbacks()](/technical/integration/javascript-api/relevantdigital.addauctioncallbacks.md) — Register auction lifecycle callbacks.
* [relevantDigital.loadPrebid()](/technical/integration/javascript-api/relevantdigital.loadprebid.md) — Load and configure HB Manager auctions.


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