It’s been debated for many years, but Google says that content inside of an accordion or tab on your site will get just as much credit as other text on the page.
This article from Search Engine Roundtable gets further into Google’s thoughts on this.
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It’s long been thought that content on a page that was tucked into an accordion or tab would get less weight than other text on the page, but Google says that’s not true.
Google’s Gary Illyes recently said on Twitter “We index the content, its weight is fully considered for ranking, but it might not get bolded in the snippets”.
The lack of bolding in the snippets hurts a little bit, but Google still counts the content behind tabs as strongly as other content on the page.
This doesn’t mean that you should be building mega-pages with tons of accordions and tabs. Google still looks at how well the PAGE ranks for a given search query, and you can’t rank for wildly different keywords on a single page. However, if you have content behind a tab that helps solidify the main point of the page, rest assured that Google will give it full credit.