Trying to figure out if Safari does or doesn't support iOS 11's new image format HEIC/HEIF. Have tried numerous things and it doesn't appear to work. Thanks.
By checking on CanIUse, iOS11 dose't support HEIF in Safari, and I just have a test on iOS11.0.3, yep, it is really not supported.
On MacOS, it is supported on specified platform, which seems like KabyLake CPU, you can check it on WWDC.