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

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🕒 ~1 min 🎯 5 questions
★★ Is your brand disappearing from the SERPs for no apparent reason: can Google feedback really fix it?
If a site disappears from search results for its brand name without an identifiable reason (no manual penalty in Search Console, no obvious spam links), use the 'Send feedback' button at the bottom of...
Anonyme (金谷武明) Jun 04, 2020
★★ Does the number of JavaScript files really slow down Google indexing?
Google renders all JavaScript files on a page in a single rendering pass, not file by file. The number of JS files does not proportionally increase the rendering delay in the indexing process....
金谷武明 Jun 04, 2020
★★★ Should you really be worried about duplicate content from scraping?
If content is copied by scraping/hacking sites, the original site is unlikely to be penalized for duplication. Submit the URLs of hacked sites via Spam Report for Google to process them quickly....
金谷武明 Jun 04, 2020
★★★ Should you choose a subdomain or a new domain for launching a service?
To launch a new service, choose between a subdomain and a new domain based on user experience, not presumed SEO gains. Optimizing for SEO from the outset often leads to strategic regrets later....
金谷武明 Jun 04, 2020
★★★ Why is Google delaying the complete transition to the Mobile-First Index?
The full migration to the Mobile-First Index, initially scheduled for September 1st, may be postponed due to the health situation. Google will announce the final date later....
金谷武明 Jun 04, 2020
★★★ Should you really report every scraping URL via the Spam Report to prompt action from Google?
In the face of mass scraping or hacked sites displaying stolen content, Google advises reporting each URL via the Spam Report. Although each report may not lead to individual action, these reports ass...
Anonyme (金谷武明) Jun 04, 2020
★★ Do Google penalties really transfer between domains and subdomains?
Google does not publicly specify whether a manual penalty on a main domain affects its subdomains or the other way around, as it would reveal the internal workings of the anti-spam fight. Google recom...
Anonyme (金谷武明) Jun 04, 2020
★★ Does the HTTP header rel=canonical really work to manage duplicate content?
The rel=canonical attribute specified via the HTTP header is still recognized and effective. Google recommends using it if pages (like PDFs) are duplicated across multiple domains (separate PC and mob...
Anonyme (金谷武明) Jun 04, 2020
★★★ Should you still optimize rel=next/prev tags for pagination?
Google no longer uses rel=next/prev tags for pagination. There is no specific signal to send. All paginated pages can be indexed normally. The XML sitemap should contain important pages, not necessari...
金谷武明 Jun 04, 2020
★★ Should you really overlook PageRank when deciding between a domain and a subdomain?
Do not structure domains/subdomains based on presumed PageRank or internal/external links. Choose the architecture based on user logic. Services started in a subdomain sometimes surpass the main domai...
金谷武明 Jun 04, 2020
★★ Are Search Console tools really enough to solve your indexing problems?
To resolve indexing issues, check the registration in Search Console, submit an indexing request via the URL Inspection Tool, and send an XML sitemap. If the problem persists, provide detailed screens...
金谷武明 Jun 04, 2020
★★ Does Googlebot really render all JavaScript in a single pass?
When a page loads multiple JavaScript files, Googlebot executes them all at once in a single rendering session, exactly like a traditional web browser. The number of JS files does not trigger multiple...
Anonyme (金谷武明) Jun 04, 2020
★★★ Can you relaunch an old domain without being penalized for duplicate content by spammers?
If a site that has been closed for a year is relaunched on a new domain and its content has been copied by scraping sites, Google will likely not penalize the legitimate site for duplication. The algo...
Anonyme (金谷武明) Jun 04, 2020
★★★ Subdomain or New Domain: What Does Google Really Think for SEO?
To launch a new service, the choice between a subdomain and a new domain should be based on user experience and business logic, not on SEO considerations. Google advises against making decisions based...
Anonyme (金谷武明) Jun 04, 2020
★★★ Can Google really delay Mobile-First Indexing indefinitely?
The forced migration of all sites to Mobile-First Indexing, initially planned for September 1, 2020, may be postponed. Google is re-evaluating this date due to the COVID context and will communicate a...
Anonyme (金谷武明) Jun 04, 2020
★★★ Why is it never enough for Google to copy content word for word during a migration?
Copying content word for word during a migration (e.g., from WordPress to React) is not enough. Google also analyzes titles, headings, images, design, navigation, and the structure of internal links. ...
John Mueller May 29, 2020
★★★ How can fixing a failed migration within 48 hours completely change your rankings?
After a problematic migration, identifying and fixing differences as quickly as possible is crucial. The longer you wait, the more Google systems learn about the new site as a different site and adjus...
John Mueller May 29, 2020
★★★ Does a clean 301 redirect really transfer 100% of PageRank without any loss?
A clean, page-by-page 301 redirect, with no remaining content on the old site, transfers all signals (including PageRank) to the new domain. A partial or late redirect (e.g., a year later) forces Goog...
John Mueller May 29, 2020
★★ Does JavaScript server-side rendering hide invisible SEO errors from users?
JavaScript server-side rendering (SSR) produces static HTML similar to WordPress, but if SSR is configured specifically for Google, numerous errors can occur that are invisible to normal users. Compar...
John Mueller May 29, 2020
★★ How do you set up hreflang and x-default for geographic 301 redirects without losing indexing?
Redirecting users from one country to a different domain (with a canonical link to the main domain) is possible. Using hreflang with x-default for the redirect page helps Google understand the structu...
John Mueller May 29, 2020
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