Looking for a tutorial on this effect

I am just starting a new project that will involve a bit of animation. I really like the effect where some content pauses as you scroll, and then starts again as you scroll a bit more.

Like on this page - the paragraph that starts “I create professional portraits on the left…”

Can anyone point me in the direction of a tutorial to show how to achieve that effect?

Thank you!

OK, I think I’ve found it already. Google understood my wordy description of the effect, which is called ‘CSS sticky’, and found this, which I’ll leave here for future reference:

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