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Client-Side Rendering

Building page content in the browser with JavaScript after the server has already sent its response.

Also known as CSR, Browser rendering. Updated .

What it means

The server sends a small document and some script. The script runs, fetches data, and builds the page. A person with a browser sees a full page. A retriever reading the raw response sees an empty frame.

Most AI crawlers do not execute JavaScript, and the ones that do treat it as expensive and optional.

The part a short definition leaves out

This is not an argument against JavaScript frameworks. It is an argument for server-side rendering or pre-rendering the content those frameworks produce, which every major framework now supports and which is a build decision rather than a content one.

Where this comes from

Related terms

  • App Shell A near-empty HTML document containing a single mount element that script later fills with the real content.
  • Structural Issue A finding whose cause sits above the page, in the architecture, rendering model, or hosting, and cannot be fixed by editing content.
  • Boilerplate Ratio How much of a page response is actual readable text compared with markup, script, and embedded data.

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