On 246 ranking store homepages rendered on a phone, fixed banners, cookie notices and popups cover a median 7.1% of the first screen; 8.5% cover more than a quarter and 4.1% more than half.
Source: PageSpeed Matters, Oct 2026. Phone render at 390x844.
Coverage includes sticky headers and cookie banners, not only popups.
Source: Mobile Popup and Banner Clutter: 8.5% of Store Homepages Cover 25%+ - PageSpeed Matters