Websites Powered by Intersection Observer

15,448 websites tracked using Intersection Observer (Performance) · www.w3.org

Intersection Observer is a performance optimization tool that speeds up the site. Its official site is w3.org. PoweredBy tracks the websites that use Intersection Observer across the public web; the tracked counts, adoption trend, and site list on this page are updated from our ongoing crawl of the performance ecosystem.

Usage trend

Core Web Vitals

Median site among 6,124 Intersection Observer sites with Chrome UX data, p75 values, Aug 2026.

Top countries

Japan 3,663

India 493

United States 490

France 396

United Kingdom 318

Italy 317

Germany 272

Indonesia 256

Sites using Intersection Observer by audience country, Chrome UX Report.

Usage by industry

Share of each industry's websites with a detected stack that use Intersection Observer; industries come from what sites declare in their own structured data.

Top sites by authority

The share of the web's most authoritative domains, by Open Page Rank tier, seen running Intersection Observer in recent crawls. Only 372 domains worldwide score 9 or higher.

Websites using Intersection Observer

Open Page Rank is the domain's authority score (0 to 10, from the open web link graph); the list is ordered by it and covers sites seen in recent crawls. Visits and keywords are estimated US organic search figures.

Download top 10,000 as CSV (zip) →

Columns: domain, Open Page Rank, first seen, last seen, industry (from the site's own structured data, blank when none).

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