Is the data indexed by search engines loaded via lazy load?

Question

Google

Is the data indexed by search engines loaded via lazy load?
Has anyone done an experiment?

Answer 1

I heard that Google is yes, but Yandex is not.

Answer 2

Information update:
asked the head of Yandex.Webmaster (Elena Pershina):
in short, Yandex will not read lazy load. More precisely, read the first visible part. And that's it.
Here is a link to the answer (and a branch that may grow further):
https://yandex.ru/blog/search/indeksatsiya-izobraz...