How To Change Multiple Small-res Image Source With The Actual High-res Image After They Have Been Loaded?

I'm working on a webpage that loads high-resolution images after low-res images are applied and set them to the initially loaded small low-res images. This is done to load smaller

Solution 1:

As the comment suggests, Progressive image loading like medium can be implemented by using a simple open-source files from GitHub blurry-image-load. Read readme.md and add the necessary files to your project and follow the instruction.