The primary goal of unlazy is to provide a smooth transition from a placeholder image to the actual image. A common approach is to use a blurred version of the actual image as a placeholder.
Inlining a blurred version of the actual image is not always possible, e.g. when the image is loaded from a CDN. In this case, you can use a BlurHash or ThumbHash placeholder instead. Both are very compact representations of a placeholder for an image.
The following placeholder formats are supported: