2.1.1029 Part 1 Section 20.93, draw:background-size

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a.   The standard defines the attribute draw:background-size, contained within the element <style:drawing-page-properties>

This attribute is not supported in PowerPoint 2013, PowerPoint 2016, or PowerPoint 2019.

On load, PowerPoint writes this attribute as "border" On load PowerPoint ignores this attribute.