Watch: Site Engagement Metrics
The Google Site Engagement Metrics Framework in Chromium tracks user interactions, engagement scores, and browsing behavior using UMA histograms.
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When you browse the web using Google Chrome, the browser keeps track of how much you interact with different websites. This is done through the Site Engagement Metrics Framework.
Every time you visit a site, click, scroll, or play media, Chrome awards engagement points to that specific domain. For instance, navigating to a page gives you a small boost, while installing a site as a web app gives you a much larger point increase. There is a daily cap on how many points a site can earn, which is usually fifteen points.
But these scores are not permanent. If you stop visiting a website, its score will gradually decay over time. This ensures that your engagement scores always reflect your current browsing habits.
Chrome uses these total scores to categorize your relationship with a site into levels, ranging from minimal to high engagement. Behind the scenes, the browser aggregates this data using User Metrics Analysis histograms to analyze overall trends. If you are curious, you can even view your own engagement scores directly inside the browser to see which sites you interact with the most.