Hi! PD4ML_ABSOLUTE_ADDRESS_SPACE=document forced older versions of PD4ML to ignore impact of page breaks on the vertical coordinate axis.
Let’s say you have an image absolutely positioned at y=200px and it still fits the first page of the document, and in your document there is a forced page break at 100px.
With PD4ML_ABSOLUTE_ADDRESS_SPACE=document the image was placed still on the first page, but regular flow content with y>100px went to the next.
With PD4ML_ABSOLUTE_ADDRESS_SPACE=page the image was placed on the next page as the regular flow content with y>100px.

The option is not supported by v4 (until a customer request). The current behavior matches PD4ML_ABSOLUTE_ADDRESS_SPACE=page