What does Google say about SEO? /
This category compiles all official Google statements regarding JavaScript and technical aspects of search engine optimization. Modern JavaScript frameworks (React, Angular, Vue.js) and web application architectures (SPA, SSR, CSR) present critical challenges for crawling and indexing. Google's guidance on JavaScript rendering, dynamic DOM manipulation, AJAX implementation, and API calls is essential for ensuring client-side content visibility. SEO professionals will find authoritative positions on implementation best practices, differences between server-side and client-side rendering, and recommendations for optimizing load times while guaranteeing content accessibility to search crawlers. Understanding data formats (JSON, XML) and their SEO implications completes this vital resource. These official declarations help prevent common technical implementation mistakes that can severely impact the search performance of modern websites and JavaScript-powered applications. Access to Google's verified positions on these technical matters enables practitioners to make informed architectural decisions and implement JavaScript solutions that maintain strong organic search visibility while delivering enhanced user experiences.
Quick SEO Quiz

Test your SEO knowledge in 5 questions

Less than a minute. Find out how much you really know about Google search.

🕒 ~1 min 🎯 5 questions
★★ How does Google really deindex an expired site or one that’s globally 404?
When a site becomes 404 or expires, Google does not immediately deindex all pages. Frequently crawled pages (homepage, categories) disappear quickly, while others do so more slowly. Google attempts to...
John Mueller Sep 14, 2020
★★ Should you really choose the 410 code over 404 for quick deindexing of a page?
The 410 (Gone) code removes pages from the index slightly faster than the 404, but in the long term, the difference is theoretical and negligible. For urgent removal, using the removal tool in Search ...
John Mueller Sep 14, 2020
★★ Does Google Tag Manager affect your content to the point of impacting your SEO?
If the 'container tag' refers to Google Tag Manager, Google processes it during the page rendering. GTM can add, modify, or remove content via JavaScript. Using URL Inspection allows you to see the re...
John Mueller Sep 14, 2020
★★★ Could your meta tags be hiding from Google without you even knowing?
Some third-party scripts inject tags (e.g. iframe) at the top of the <head>, which can lead Google to believe that the <head> is prematurely closed. Result: robots metatag, canonical, hreflang may be ...
John Mueller Sep 14, 2020
★★★ Are Google’s manual penalties always visible in Search Console?
If a manual action has been taken by Google's Webspam team, it will almost always be visible in Search Console. There are a few rare edge cases where this would not be displayed, but for a normal site...
John Mueller Sep 14, 2020
★★★ Are high-DA backlinks without value really harmless for your SEO?
Creating dofollow backlinks on high DA/PA sites (Domain Authority, a third-party metric) does not help SEO if these links are ignored by Google (because they are spammed by others). These efforts have...
John Mueller Sep 14, 2020
★★★ Can a blog on a subdomain really pass SEO authority to the main site?
For a blog on a subdomain (e.g., Shopify + WordPress) to pass authority to the main site, Google primarily relies on internal links and the fact that both are on the same root domain. Similar design o...
John Mueller Sep 14, 2020
★★ Is footer content really treated as standard content by Google?
Content placed in the footer is treated like normal content located at the bottom of the page, provided that it is legible and not hidden. Google performs a viewport expansion during rendering and det...
John Mueller Sep 14, 2020
★★ Restoring a 404 URL: Does Google Really Wipe All Traces of Its Past Authority?
When a previously 404 URL returns to a 200 status, Google treats it like a fresh URL with no 'score' or 'authority' retained from the old version once it has been deindexed. However, external signals ...
John Mueller Sep 14, 2020
★★ Why does Google show spam in brand search results beyond the first page?
If phishing or spam sites are massively appearing on deep pages (top 10 pages) of brand results, it’s often because Google lacks quality content to show beyond the first page. Patterns of spam should ...
John Mueller Sep 14, 2020
Why does Search Console only show partial data for the News section at launch?
Data for the News section in Search Console (for News mode in Search, not Google News App) only goes back to around July 2020, which is when data collection began. For older sites, this view will be l...
John Mueller Sep 14, 2020
★★ Should you consider using Prerender for serving static HTML to Googlebot?
Using a service like Prerender to serve static HTML to Googlebot instead of letting Google render JavaScript can reduce technical risks during migrations or changes. It is not required, but it can sta...
John Mueller Sep 14, 2020
★★★ Do blog backlinks to product pages really convey authority?
Creating internal links from a blog (that naturally attracts backlinks) to the product or category pages of an e-commerce site is a recommended practice. The backlinks obtained by the blog help streng...
John Mueller Sep 14, 2020
★★ Is it true that Google really ignores your tracking scripts during rendering?
Google ignores certain scripts during rendering if they are not necessary for displaying the page. Google Analytics and other common analytics scripts are automatically detected and skipped to speed u...
John Mueller Sep 14, 2020
★★★ Do Images in XML Sitemaps Count Toward the 50,000 URL Limit?
We know that XML Sitemap files are limited to 50,000 URLs. We also know that for each page URL, we can indicate the URLs of the main images it contains. But do these image URLs count as part of the 50...
John Mueller Sep 09, 2020
★★★ Does Google Really Flag Domains as "Toxic" in Its Algorithm?
John Mueller explained on Twitter that Google doesn't have a "flag" indicating that a domain name is toxic: "We don't have a concept of a toxic domain. It's good to use tools to work on your site, but...
John Mueller Sep 09, 2020
★★★ Can Google Really Block a Page's Visibility Based on Country?
John Mueller explained on Twitter that there is no system or mechanism on Google's search engine to limit a page's visibility to one country or another. For example, a page that could be visible on Go...
John Mueller Sep 09, 2020
★★ 404 or noindex for deindexing: which method should you really prefer?
Using 404 or noindex to remove pages from the index produces the same final result. Noindex can be slightly faster, but the difference is negligible at the scale of a site. Choose the most practical m...
John Mueller Sep 04, 2020
★★★ Hreflang in HTML or XML Sitemap: Is There Really a Difference for Google?
For implementing hreflang, Google treats the <head> HTML tag and the declaration in an XML sitemap exactly the same. Both methods are equivalent, and the choice depends on the ease of implementation f...
John Mueller Sep 04, 2020
★★ Should you reconfigure Search Console every time you migrate from www to non-www?
When changing a prefix (www/non-www), you must verify the new property if the verification is prefix-based. Domain verification avoids this problem. Search Console is not required for the website's op...
John Mueller Sep 04, 2020
🔔

Get real-time analysis of the latest Google SEO declarations

Be the first to know every time a new official Google statement drops — with full expert analysis.

No spam. Unsubscribe in one click.