Nice. I do that as well, but with WebP only (WebP’s header is smaller than JPEG, I remember that Facebook article about their app reconstructing the JPEG header…).
So WebP-supporting browsers get the tiny base64 preview and the full image loading over it, and JPEG-only browsers get a progressive JPEG (mozjpeg-optimized), with the image’s dominant color as the background before the JPEG even starts loading.
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