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Official statement

The mobile-friendliness validator can swing between 'valid' and 'invalid' for the same URLs. This can be due to caching or stability issues with the classifier. If only a few URLs fluctuate and the site performs well on mobile, there is no cause for concern.
🎥 Source video

Extracted from a Google Search Central video

💬 EN 📅 22/09/2021 ✂ 14 statements
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✂ Other statements from this video 13 ▾
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  4. □ Why does Google index blocked pages by robots.txt?
  5. □ How does Google view window.history.pushState in terms of SEO?
  6. □ Does mobile compatibility really have a significant impact on your SEO?
  7. □ How can CDNs disrupt your site's mobile display?
  8. □ Is it true that JavaScript-loaded content remains invisible to Googlebot?
  9. □ Could HTML Buttons Be Undermining Your SEO Efforts?
  10. □ How can you ensure that every URL in your SPA is properly indexed by Google?
  11. □ How Does the Compatibility of the Beacon API with the WRS Influence Your SEO Tracking?
  12. □ How can you ensure that content beneath the viewport is acknowledged by Google?
  13. □ Are Google’s Testing Tools Truly Reliable for SEO?
📅
Official statement from (5 years ago)
TL;DR

The mobile-friendliness validator can fluctuate between 'valid' and 'invalid' for the same URLs. This is explained by caching issues or classifier problems. If the majority of your site is mobile-friendly, stay calm.

❓ Frequently Asked Questions

Est-ce que ces fluctuations affectent mon ranking?
Peu probable, si votre site globalement fonctionne bien sur mobile.
Dois-je ignorer ces fluctuations?
Surveillez-les, mais ne paniquez pas. Vérifiez les tendances globales du site.
Comment savoir si c'est un probleme de cache?
Comparez les résultats avec différents outils et après avoir nettoyé le cache.
🏷 Related Topics
Mobile SEO Domain Name Pagination & Structure Web Performance

🎥 From the same video 13

Other SEO insights extracted from this same Google Search Central video · published on 22/09/2021

🎥 Watch the full video on YouTube →

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