Which bots actually execute JavaScript, measured with an in-page beacon instead of inferred from fetches: renderers vs. HTML-only crawlers, what triggers a render, and how deep the execution goes.
Reflection AI's crawler visited our test bed 69 times between 18 September and 25 October. On 12 of its 13 visits to client-side-rendered pages, a second address fetched the page again and ran the Rea...
In August, Meta's AI crawler visited with a Chrome-based user agent and executed both our inline script and the React app, usually within a second of fetching the page. 83 beacons between 10 and 20 Au...
Our JS-execution beacon fires through two channels - an inline script and a React client component. Over 80 days the bots sort into four tiers: renderers that evaluate React but skip inline scripts (A...