Always test your pages using Google’s own tools and third-party resources to view the rendered HTML to make sure all your content is showing up.

Why JavaScript Can Be A Problem We know that to ingest information, Googlebot will discover a page, crawl it, parse and index it. For JavaScript, the crawler needs to “render” the code.

Google says there’s no need to worry about JavaScript when it comes to search, as there’s nothing fundamentally different about it compared to static content.

JavaScript is the second-largest contributor to page weight, behind images, which means it can play a major role in slowing down the speed of your mobile site. Here's how you can reduce your reliance ...