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With Ink, the engine measures where the last painted content is after the page is rendered, so what the page paints outside its layout - a shadow, a positioned decoration - is kept, together with the space the last element leaves below itself.
With Marker, the content ends where the page's layout ends, the way earlier versions cut; something painted outside the layout can be cut. Only the last page is affected: the pages before it are the same in both modes.
An engine that does not support the Ink mode uses the Marker mode.