My imac has a ghost image of what appears to be an internet page. The imac has never been left switched on unattended. Always put in sleep mode if left for a few minutes.
That issue can sometimes happen over time when the majority of your usage is with a browser and the window is always in the same spot. It doesn't necessarily need to be stuck on the screen for hours with a static image. Many Macs will show a ghosting of the menu bar after years of use, when displaying a solid color in full screen mode, because the menu bar couldn't be "hidden" before El Capitan.
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