Connection between JavaScript and SEO

Google has provided with an explanation on when JavaScript does and doe not matter for SEO. It is something that is worth worrying about.

WHAT IS A JAVASCRIPT SITE?
Sites which use JavaScript does not necessarily qualify as a "JavaScript site". A type of JavaScript is a single page app which basically consists of a shell which includes various views displaying different content.

When using Instagram on your mobile device, the header and footer remain static however the JavaScript is used to fetch and display the main content. Some of the single page apps include Angular and React.

WHEN IS JAVASCRIPT RELEVANT FOR SEO?
When you dynamically load or modify critical content it is at that point that the JavaScript becomes relevant for SEO. Suppose if you are able to view the page source and also see all the critical content at that point the Javascript is not relevant to SEO.
Read more at searchenginejournal.com
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