Official statement
The fact that JavaScript blocks the main thread is not a problem for Google's rendering. However, it impacts real user experience by making the site unresponsive, which in turn affects page speed, a ranking factor.
Other statements from this video 13 ▾
- □ Is hidden content truly visible to Google?
- □ Do Google’s third-party tools really impact your SEO?
- □ Why Have #! Fragments Become a No-Go for SEO?
- □ Does JavaScript Really Affect Crawlability?
- □ Why does Google render after crawling?
- □ How Are JavaScript Resource Requests Impacting Your Crawl Budget?
- □ Could JavaScript harm your SEO the way Flash did?
- □ Is it possible to avoid cloaking with localized user experiences?
- □ Could using URL fragments for JavaScript modals actually boost your SEO?
- □ Why should you steer clear of inline JavaScript for large SEO scripts?
- □ Is it true that the canonical tag is often overlooked by Google?
- □ Does AMP really affect your website's SEO?
- □ Why is page speed essential for SEO rankings?
Official statement from
(5 years ago)
⚠ A more recent statement exists on this topic
How can you improve FID by analyzing the main thread?
View statement →
TL;DR
For Google, JavaScript blocking the main thread does not affect rendering. However, be cautious, as this harms user experience and can influence page speed, a ranking factor.
❓ Frequently Asked Questions
Est-ce que Google peut vraiment ignorer le blocage par JS ?
Pour son rendu, oui. Mais cela ne se traduit pas par une bonne expérience UX, ce qui peut impacter indirectement le classement.
Pourquoi l'UX est-elle si importante dans le SEO ?
Une mauvaise UX affecte la vitesse de la page et l'engagement, ce qui sont des facteurs de classement indirectement.
Dois-je désactiver tout JavaScript pour améliorer l'UX ?
Non, il s'agit d'optimiser, pas de désactiver. Un bon JS est un atout si bien utilisé.
🎥 From the same video 13
Other SEO insights extracted from this same Google Search Central video · published on 26/05/2021
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