Simple lazy loading solution (without JS libraries)?

Hey I am looking for a simple lazy loading solution for images (that doesn’t require JS libraries etc.)

I know that from Chrome 75 I can enable lazy loading flag (chrome://flags/#enable-lazy-image-loading) but this is not a standard, cross-browser solution.

This simply isn’t possible without JS if you need cross browser support. You don’t need a library, it’s fairly easy to write yourself. If you don’t mind importing a (vanilla) script, I can recommend this: https://github.com/verlok/lazyload