Hello. Thanks for listening to SEO tips today.
In the past Google might try to trigger that, but it’s expensive. Instead, Google uses frame expansion to render the page on a very long viewport. It’ll do that once & see what loads, then index what it can see in that viewport/frame. So if your content is outside of that viewport/frame, they won’t index it. Here’s the spot in a Hangout video where John Mueller explains this:
Keep in mind that EVEN if the content is indexed, it probably won’t rank as well as content that is visible on page load.
Thanks for listening. Come back tomorrow for another SEO tip.