If you inspect the page It appears they are generating a blurred version of the png on the fly in js. The source of the blurred version of the image is equal to

If you inspect the page It appears they are generating a blurred version of the png on the fly in js. The source of the blurred version of the image is equal to "data:image/png;base64,iVBOR…7WkYklgQdZAAAAABJRU5ErkJggg==" while the none blurred version is https://beta.icloud.com/system/cloudos/1SBeta.102619/en-us/source/resources/images/mail_icon.png https://beta.icloud.com/system/cloudos/1SBeta.102619/en-us/s...