The direct answer
Some sites load meaningful text only after JavaScript runs. That can create a different experience for crawlers, preview tools and visitors whose scripts fail.
Start with the evidence
Compare the initial HTML with the rendered page. Check whether titles, core content, links and business facts exist before client-side requests complete.
Make the change deliberately
Prefer dependable delivery of important content and verify the site's rendering path. JavaScript use alone is not proof of an SEO failure; evaluate what each relevant tool can actually retrieve.
Further reading
Platform guidance can change. Consult the current official documentation before making platform-specific changes.
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