2.1.1604 Part 1 Section 21.3.2.10, ext (Shape Extent)

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a.   The standard inverts the terms width and height when describing attributes cx and cy.

In Office, the cx attribute represents the extent width (horizontal size) and the cy attribute represents the extents height (vertical size).

b.   The standard allows the value of attributes cx and cy to be zero.

If the value of either the cx or cy attribute is zero, Office will ignore it and use the object transform (xfrm). If the object transform is also invalid, the object will not be shown