paper-size-unit

Arguments: printer

Returns either :inch or :mm to indicate whether the paper-width and paper-length properties of the printer stream are in inches or millimeters. If paper-size is :letter, for example, then paper-size-unit will be :inch, paper-width will be 8.5, and paper-length will be 11.

If paper-size is :a4, then paper-size-unit will be :mm, paper-width will be 210, and paper-length will be 297. This property is derived from the paper-size property and may not be specified programmatically.

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Created 2010.1.21.