Learned from https://www.phpied.com/minimum-viable-no-image-image-src/
You can use this for lazy load images in pages
<img
src="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg'/>"
...
>Hmm, when I inspected his demo image, I saw new img attribute named decoding="async", so interesting! So we can tell browser not to wait process this dummy image for later and priority the rest higher. (Good for LCP vital metric)