The Google Search team has made a number of relatively minor changes to its JavaScript documentation and also removed much of the dynamic rendering documentation, as it has been deprecated as a workaround for many years now.
I’ll show you what changed:
On the Understand the JavaScript SEO basics – if you compare it to the older version:
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On the Fix Search-related JavaScript problems this is what changed:
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On the Fix lazy-loaded content page, this is what changed:
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On the Dynamic rendering as a workaround document (old one here), Google removed the whole section on how to “Implement dynamic rendering,” “Verify your configuration” and the “Troubleshooting” sections.
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Forum discussion at X.