What does Google say about SEO? /
Martin Splitt is a Developer Advocate at Google, specializing in JavaScript rendering and modern web application indexing. He created the 'SEO Mythbusting' video series and regularly explains how Googlebot handles JavaScript frameworks. His statements are essential for developers looking to optimize the SEO of their applications.
Quick SEO Quiz

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🕒 ~1 min 🎯 5 questions
★★ Should we treat SEO visibility as a technical requirement just like performance?
Developers must consider search engine visibility as a technical requirement just like performance or accessibility. A fast and accessible site is pointless if no one can find it....
Oct 30, 2020 ⚡ Analysis available
★★ Is Google’s rendering service blocking your cross-origin resources due to CORS?
Google's web rendering service is bound by CORS (Cross-Origin Resource Sharing) principles, APIs, and headers. If you have cross-origin requests to another subdomain or origin, you must ensure they ar...
Oct 15, 2020 ⚡ Analysis available
★★ Do duplicate data in your script tags really harm your SEO?
From an SEO perspective, it is perfectly acceptable to store duplicate data in a script tag. This does not pose any issue for natural search engine optimization....
Oct 15, 2020 ⚡ Analysis available
★★★ Can lazy hydration really harm your crawl budget?
Lazy hydration can be beneficial for user experience and interactivity time. However, if it causes issues or if the content does not appear in the rendered HTML during testing, then lazy hydration doe...
Oct 15, 2020 ⚡ Analysis available
★★★ Why can't Google share JavaScript cache across your domains?
Google cannot cache a popular JavaScript resource (like jQuery) in one place for use across different domains. If a resource is broken on your site, Google won't fetch it from another site, as this wo...
Oct 15, 2020 ⚡ Analysis available
★★★ Does Google really over-cache your site's resources?
Google's caching is very aggressive and tends to over-cache rather than under-cache. If a resource is momentarily broken, it usually isn't a problem because Google does not fetch resources at every re...
Oct 15, 2020 ⚡ Analysis available
★★ Does Google's JavaScript cache really work based on origin instead of domain?
Google's caching system for JavaScript and other resources is based on origin, not on a shared domain among multiple sites. Each origin has its own resource cache....
Oct 15, 2020 ⚡ Analysis available
★★★ Why do Google test tools never reflect what Googlebot truly sees?
Testing tools (URL Inspection Tool, Rich Results Test, Mobile-Friendly Test, AMP Test) always perform a fresh fetch and bypass the cache to test the latest version. This differs from actual crawls and...
Oct 15, 2020 ⚡ Analysis available
★★★ Should you really ignore the live test in Search Console to diagnose your indexing issues?
To verify how Googlebot really sees your page, examine the 'crawled page' version in the URL Inspection Tool instead of the 'live test'. The crawled version better reflects actual indexing because it ...
Oct 15, 2020 ⚡ Analysis available
★★ Why does Google ignore your images during rendering for indexing?
Google often skips loading images during rendering because they are not necessary for most of the indexing process. The image index is a separate entity. This is why some images may appear as unavaila...
Oct 15, 2020 ⚡ Analysis available
★★★ Why does Google emphasize media queries instead of user-agent for responsive design?
To adapt your site to different screen sizes (mobile vs desktop), rely on CSS media queries and screen size, not on user-agent. This also applies to Core Web Vitals tests that only change the screen s...
Oct 15, 2020 ⚡ Analysis available
★★ Do Google’s testing tools really give the same results?
All single URL testing tools (Single URL Inspection Tools or SUIT) use the same pipeline and infrastructure: Rich Results Test, Mobile-Friendly Test, AMP Test, and URL Inspection Tool. Differences in ...
Oct 15, 2020 ⚡ Analysis available
★★★ Do intermittent server errors really affect your Google indexing?
Temporarily unavailable resource issues are extremely rare in production due to Google's aggressive caching. Even if your server only serves a script once and then fails for a month, you shouldn't see...
Oct 15, 2020 ⚡ Analysis available
★★ Can Google really detect JavaScript rendering errors on my site?
JavaScript rendering is an integral and transparent part of the indexing process. Google does not report very specific errors related to rendering because the system automatically retries in case of f...
Oct 15, 2020 ⚡ Analysis available
★★ Can JavaScript really manage the entire lifecycle of a Single Page App for SEO?
Single-page applications use JavaScript to control the lifecycle of the page. JavaScript is used to create the HTML that makes up the page and to load additional content as users navigate to different...
Oct 14, 2020 ⚡ Analysis available
★★★ How can you prevent indexing errors linked to code paths that Googlebot might reject?
It's essential to ensure that all code paths are covered to avoid problematic scenarios. For instance, one should not assume that certain features (like geolocation) will always be available. Googlebo...
Oct 14, 2020 ⚡ Analysis available
★★★ What happens when Googlebot consistently misses your pages if the URL never changes?
Googlebot uses URLs to locate different pages or views. If the application does not change the URL during navigation between views, Googlebot will only see the homepage and nothing else....
Oct 14, 2020 ⚡ Analysis available
★★★ How can you ensure your single-page app is crawlable by Google without losing its indexing?
For Googlebot to access the different views of a single-page app, it is necessary to use the History API and appropriate link markup with href attributes to expose the views as URLs in the links....
Oct 14, 2020 ⚡ Analysis available
★★★ Why does Google emphasize unique titles and meta descriptions for each view?
It's important to have specific titles and meta descriptions for each view rather than a generic title and description for all. This improves visibility in search results and helps users find specific...
Oct 14, 2020 ⚡ Analysis available
★★★ Why does sending a HTTP 200 on your errors sabotage your crawl budget?
HTTP status codes help Googlebot and browsers determine how to handle a response. In single-page apps, the server no longer directly handles errors, but it is crucial to return the correct HTTP status...
Oct 14, 2020 ⚡ Analysis available
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