medium.com Lazy loading Image and ifream gits code ，How to screenshots ？

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hi guys
I have a problem

like https://alabou-ismail.medium.com/javascript-promise-tutorial-resolve-reject-and-chaining-in-js-and-es6-c9d9690c5927

this page images is lazy loading show . if not disabled javascript , this page images will not show .

like this https://towardsdatascience.com/run-your-python-code-as-fast-as-c-4ae49935a826 (is medium too)

this page contain https://gist.github.com/ code . then code will not show in screenshots。 like ifream？

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1. how to show lazy loading image ,if not disabled javascript
2. how to show page ifream ? like gits.github.com code ?