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.
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★★★ Is it true that the History API is really seen as a redirect by Google?
If Google detects that a page is using the History API to change the URL during loading, it classifies this as a redirect and will try to crawl and index the destination URL (the new URL) during the n...
John Mueller Feb 12, 2021
★★★ Is Lazy Loading and Responsive Images the Real Key to Core Web Vitals or Just Google's Generic Advice?
Images are often the largest contributor to the overall page size. Google recommends optimizing images by using lazy loading and responsive image techniques to provide fast, high-quality user experien...
John Mueller Feb 10, 2021
★★ Do you really need to wait 30 days to see the impact of your Core Web Vitals optimizations in PageSpeed Insights?
Field data in PageSpeed Insights is delayed by about 30 days. To quickly verify if changes are improving performance, use lab data from testing tools, then wait 30 days to see the actual impact in the...
John Mueller Feb 05, 2021
★★★ Why does Google Discover traffic drop off overnight without warning?
Google Discover traffic tends to be highly variable, going from a lot to zero quickly. The algorithms can decide that it's relevant to show a site in Discover and then suddenly stop. This is not relat...
John Mueller Feb 05, 2021
★★ Could Google hide one of your sites if they look too similar?
For two distinct sites without duplicate content, Google should rank them individually. If multiple very similar domains exist, Google may show only one. With two unique sites, they should appear sepa...
John Mueller Feb 05, 2021
★★ Why do PageSpeed Insights and Googlebot show different results for your site?
PageSpeed Insights is based on Chrome, not Googlebot. Googlebot also uses Chrome for rendering but must obey robots.txt for all embedded content (CSS/JS), unlike PageSpeed Insights. The differences be...
John Mueller Feb 05, 2021
★★★ How does Google really group your pages to evaluate Core Web Vitals?
Google does not have Core Web Vitals data for each page individually. Pages are grouped based on the amount of available data. This can be at the entire domain level or among groups of similar pages. ...
John Mueller Feb 05, 2021
★★★ Why does Google Discover traffic seem to vanish overnight?
Traffic from Google Discover can be highly volatile, quickly shifting from a significant amount to zero. Google's algorithms determine whether content should appear in Discover. This is not tied to a ...
John Mueller Feb 05, 2021
★★★ How does Google group your pages to measure Core Web Vitals?
Google does not have CWV data for every individual page. Pages are grouped according to the available data: at the domain/origin level if there is little data, or by groups of similar pages if there i...
John Mueller Feb 05, 2021
★★★ Should you create related content to boost your topical authority?
Creating content on topics related to your main field (e.g., laptop reviews if you sell laptops) helps build a reputation for knowledge in this area for both Google and users. This strengthens trust a...
John Mueller Feb 05, 2021
★★★ Does PageSpeed Insights really reflect what Google sees on your site?
PageSpeed Insights is based on Chrome, not on Googlebot. Googlebot also uses Chrome for rendering but must follow robots.txt for embedded resources (CSS, JS). PageSpeed Insights is not subject to robo...
John Mueller Feb 05, 2021
★★★ Are Press Relations Really Compliant with Google's Link Building Guidelines?
John Mueller reminded us on Twitter that conducting quality Press Relations to obtain links is not a problem—quite the contrary: "I love some of the things I see in public relations, it's a shame they...
John Mueller Feb 01, 2021
★★★ Do You Really Need to Pass All 3 Core Web Vitals to Get an SEO Boost?
John Mueller also explained in a webmaster hangout that, as part of the rollout of the "Page Experience / Core Web Vitals" project next May, all 3 KPIs (FID, CLS, LCP) will need to be met with positiv...
John Mueller Feb 01, 2021
★★★ Does a website that changes ownership inherit Google penalties?
When a site changes ownership and domain, Google does not apply previous manual actions to the new owner. If no manual action appears in Search Console, the site is treated as normal. Algorithms evalu...
John Mueller Jan 29, 2021
★★★ Does Google really transfer all signals in bulk during a complete site migration?
During a complete site migration, if Google can recognize that all indexable content has been moved, it transfers all signals in bulk to the new domain. This is more efficient than a partial migration...
John Mueller Jan 29, 2021
★★ Does hosting your videos externally really hurt your SEO?
From an SEO perspective, there is no difference between uploading a video to your site and embedding it from another site. It is common to use a separate CDN for videos, which is technically a distinc...
John Mueller Jan 29, 2021
★★★ Subdomains vs Subdirectories: Is there really an SEO advantage to favoring one over the other?
Google's systems are designed to treat subdomains and subdirectories essentially equivalently. There is no automatic bonus for choosing one over the other. The choice should be based on considerations...
John Mueller Jan 29, 2021
★★ Should you really report copied content from your site using Google's spam form?
If your content is copied on hacked or spam sites, use Google's spam reporting form. It's not your site that is compromised, but merely content copied elsewhere....
Google Jan 28, 2021
★★ Does LCP truly measure the speed perceived by the user?
Largest Contentful Paint (LCP) measures how quickly the user can see the most useful content on a page. It represents the moment when the main content is loaded in the page loading timeline....
Google Jan 28, 2021
★★ Does using HTTPS for your XML sitemap namespace hurt your SEO ranking?
In XML sitemaps, the namespace can be declared in HTTP or HTTPS without functional impact. Google treats both the same way. However, for consistency and maintenance reasons, it is recommended to follo...
Google Jan 28, 2021
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