Official statement
When Google detects a noindex tag that developers can't find in the code, it's often due to A/B testing frameworks that inject the noindex tag into certain variations or a percentage of requests. CDNs can also lead to this issue.
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Official statement from
(5 years ago)
⚠ A more recent statement exists on this topic
Is Noindex Enough, or Should You Use Noindex+Nofollow to Block SEO Signals?
View statement →
TL;DR
Google can sometimes detect invisible noindex tags due to A/B testing frameworks or CDNs. SEO professionals need to scrutinize these tools to prevent unwanted indexing issues.
❓ Frequently Asked Questions
Pourquoi un noindex peut-il être invisible dans le code ?
Les injections par des frameworks d'A/B testing ou les configurations de CDN peuvent rendre un noindex invisible au premier abord.
Les CDN affectent-ils la visibilité de mes balises noindex ?
Oui. Les CDN peuvent servir des pages différentes à Googlebot par rapport aux utilisateurs standards, influant ainsi sur l'indexation.
Comment déceler un noindex non désiré ?
Utilisez les outils de la Search Console pour analyser les pages non indexées et vérifiez les configurations d'A/B testing et CDN.
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