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Rendering

Rendering turns HTML, styles and executable code into a page's presentation.

From discovery to possible indexing

URL discovery → Possible crawl → Processing / rendering → Possible indexing
Simplified model, not a guaranteed sequence. A URL can be excluded at different stages; discovery and crawling do not guarantee indexing.
Text version
  • URL discovery
  • Possible crawl
  • Processing / rendering
  • Possible indexing

How it works

For SEO, check content in the initial response and after JavaScript execution.

Example

Example: A product description appears in a browser but is missing when its required script fails.

Common mistakes

Empty initial HTML can complicate discovery but does not automatically make indexing impossible.

How can you check this in practice?

Compare initial HTML with the DOM after JavaScript runs. Main text and links should exist in accessible content. Inspect script errors, blocked CSS/JS and data appearing only after an action a crawler will not perform.

Distinctions and limitations

Rendering is not indexing: text visible after JavaScript still needs processing and evaluation. SSR reduces execution dependency for main content but does not fix incorrect HTTP status or noindex.

Official sources

Editorial responsibility: Martin Zhelyazkov · Founder of Z-Consult

Updated: 05/11/2026

For a correction or question: office@z-consult.bg