Reserve 90px space for top-above-nav advert on tablet

[domlander]

What does this change?

At the tablet breakpoint, between 740px and 980px, reserve 160px less vertical space for the top-above-nav advert.

Why?

We currently reserve enough space for a 970x250 (billboard) advert from the tablet breakpoint onwards. However, we only serve this ad size from the desktop breakpoint onwards. The only fixed ad size we serve on tablet, which is also the most commonly served, is the 728x90 (leaderboard) ad size¹.

Screenshots

Before	After

Screenshares

Before

Screen.Recording.2026-06-29.at.10.02.12.mov

After

Screen.Recording.2026-06-29.at.11.07.29.mov

Footnotes

1. https://github.com/guardian/commercial/blob/381fab35ac53d782469671f60b05d3eb7fd18025/core/src/ad-sizes.ts#L269 ↩

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From guardian/actions-riff-raff.

[domlander]

Leaving this in draft until I have data on the breakdown of the ad sizes served in the top-above-nav slot at the tablet breakpoint. As long as more than half of the ads served in this slot are a maximum of 90px tall (the height of a leaderboard size advert), then it makes sense to make this change. Since we do serve other ad sizes in this slot that are larger than 90px in height, this change should be run as an AB test, to ensure that we are improving CLS for users, as we are intending.