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
★★★ Do Core Web Vitals really measure what your users actually see?
For Core Web Vitals (a future ranking factor), Google measures the performance of the version of the page that users actually see: the AMP version if that’s what displays, the classic HTML version oth...
John Mueller Aug 21, 2020
★★★ Does Google really track HTML links that are hidden by JavaScript?
If an HTML link exists in the code but a JavaScript event captures the click (for example, to display a dropdown menu instead of navigating), Google can still see and follow that HTML link. The <a> el...
John Mueller Aug 21, 2020
★★★ Should you really add nofollow to footer links between sites of the same group?
If sites belong to the same company, there's no need to add the nofollow attribute to cross links in the footer. Google recommends linking primarily by brand name. For a handful of sites, it's no prob...
John Mueller Aug 21, 2020
★★★ Why does Google measure Core Web Vitals on the actual page version your visitors are really viewing?
For Core Web Vitals (a future ranking signal, announced at least 6 months in advance), Google will analyze the page that real users predominantly view (AMP or standard HTML depending on the user journ...
John Mueller Aug 21, 2020
★★★ Can JavaScript really hide your links from Google without destroying them?
If an HTML link remains present in the rendered code even when a JavaScript event captures the click (e.g., mobile dropdown menu), Google processes it normally. The only problematic case is if the HTM...
John Mueller Aug 21, 2020
★★★ Should you still invest in AMP to optimize speed and ranking?
Speed is a ranking factor, but AMP is not necessary for having fast pages. You can create very fast non-AMP pages and slow AMP pages. What matters is the actual measured performance, not the AMP forma...
John Mueller Aug 21, 2020
★★ Can Google really treat URL changes made by JavaScript and the History API as redirects?
When JavaScript uses the History API to modify the URL after loading (e.g., simplifying parameters), Google may interpret this as a redirect to the new URL and choose it as canonical. This can be veri...
John Mueller Aug 21, 2020
★★★ Does Google Really Penalize Sites Listed in Disavow Files?
John Mueller has said it again for the 345th time 🙂: the fact that a website is listed in a disavow file submitted to Google by another site has no impact on its crawl or future rankings and does not ...
John Mueller Aug 17, 2020
★★ Should you limit the number of outbound links to the same domain to avoid a Google penalty?
Having numerous outbound links to the same domain (e.g., Netflix for a movie list) is not problematic for Google as long as it adds value for the users. It is comparable to Amazon affiliate sites with...
Johannes Müller Aug 14, 2020
★★★ Is cross-domain duplicate content really harmless for your SEO?
Having the same content in the same language across multiple domains (e.g., English content on .com and .pl) is not penalized. Google simply chooses a canonical URL. If the content differs slightly (l...
Johannes Müller Aug 14, 2020
★★★ Why does Google only index one language when your site switches through JavaScript?
If the site's language is managed solely by JavaScript/cookies (same URL for all languages), Google can only index one language version because Googlebot does not follow language switchers or use cook...
Johannes Müller Aug 14, 2020
★★★ Can you inject video tags via JavaScript without facing SEO penalties?
Google fully accepts that video tags and their metadata (poster image, etc.) can be injected by JavaScript instead of being present in the source HTML. If the tag is visible in the rendered HTML (veri...
Johannes Müller Aug 14, 2020
★★ Why does the mobile-friendly test produce conflicting results on the same page?
The mobile-friendly test can yield varying results (partially loaded, not mobile-friendly, mobile-friendly with missing resources) for the same page tested at different times. This happens because Goo...
John Mueller Aug 11, 2020
★★ Should you manually code your structured data or opt for a WordPress plugin?
Both approaches work perfectly. Google accepts structured data whether it comes from a plugin, a theme, a manual addition, or JavaScript after page load. From a practical standpoint, using a plugin al...
John Mueller Aug 11, 2020
★★ Why are your rich results disappearing from regular SERPs while they technically work?
To determine if the absence of rich results is due to a technical issue or quality assessment, perform a 'site:' query for your domain. Google typically shows rich results in these queries even if the...
John Mueller Aug 11, 2020
★★ How long does it take to recover traffic after a 301 redirect bug?
After a URL change with 301 redirects, if the new URLs have been crawled and then disappeared due to a bug (redirecting to 404), Google sees them as deleted and removes them from the index. Reindexing...
John Mueller Aug 11, 2020
★★★ Why do your rich snippets vanish even when your markup is technically correct?
When rich snippets suddenly disappear without any changes to Google's technical requirements, it is generally due to an algorithmic reevaluation of the overall quality of the site. If the markup is te...
John Mueller Aug 11, 2020
★★★ Can a bug restoring your old URLs kill your SEO?
When a site changes its URL structure with 301 redirects and then temporarily reverts to the old structure due to a bug, Google can handle this situation. If the redirects disappear and the site retur...
John Mueller Aug 11, 2020
★★★ Why are your FAQ rich snippets disappearing despite technically valid markup?
If FAQ rich snippets suddenly disappear while the structured data is technically valid, it generally indicates a reassessment of the overall quality of the site by Google's algorithms, not a technical...
John Mueller Aug 11, 2020
★★ Do soft 404s really trigger deindexing without a penalty?
A soft 404 is not considered a bad practice or a penalty. It is simply the signal that Google interprets to understand that these pages should be removed from the index. The objective is achieved: Goo...
John Mueller Aug 11, 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.