Google Updates JavaScript SEO Docs With Canonical Advice

Google updated its JavaScript SEO documentation with new guidance on handling canonical URLs for JavaScript-rendered sites.

The documentation update also adds corresponding guidance to Google’s best practices for consolidating duplicate URLs.

What’s New

The updated documentation focuses on a timing issue specific to JavaScript sites: canonicalization can happen twice during Google’s processing.

Google evaluates canonical signals once when it first crawls the raw HTML, then again after rendering the JavaScript. If your raw HTML contains one…