Images should be responsive, with at least three different size variants available for most images. Images must have alt text and should likely have title tags.
Images are lazy-loaded. Images are served in next-gen formats when supported by the browser. Images should be stored on external storage like S3 so they can be more easily shared between environments.
Images should be served with an advanced script such as Imgix.js to ensure that they are loaded at very precise sizes for each user’s machine.