Hello, The image (if any) that is displayed when a song is played is called the artwork. Can anyone tell me which artwork formats (jpg, etc.) are supported by the (Music/iTunes app on the) iPods? I need the info to go back to at least the iPod Touch. And are there any other restrictions (size, resolution)? Thanks in advance.

Every now and then I need to make a website. And I noted in my last project that background-attachment:fixed; is still not supported by iOS. It is by Safari on MacBooks, so I'm wondering what the story behind it is? Surely it is not a matter of computational cost due to the so-called repainting of the browser's canvas? Because doesn't playing video cost a multitude of that?