Technical Definition
WRS is Google's service that renders JavaScript pages. Uses an evergreen Chromium version. Has resource limits: timeouts, resource caps. Rendering is decoupled from crawling and may be delayed. For critical content, SSR is preferred over client-side rendering. WRS handles most modern JavaScript.
Simple Explanation (ELI13)
WRS is the part of Google that renders JavaScript pages. It's basically a Chrome browser that Google uses to see what your JavaScript creates. It's pretty good at modern JavaScript but has limits. If your content needs JavaScript to appear, WRS is what processes it.
Related Terms
Rendering, JavaScript SEO, Crawling, Googlebot
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