2.1.427 Part 1 Section 17.15.1.94, zoom (Magnification Setting)
a. The standard states that the percent attribute is required.
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Word does not always require this attribute.
b. The standard specifies that a percent attribute value of less than the minimum zoom level shall result in display of the document using the application's minimum zoom level.
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Word treats this attribute as omitted when it has a value of 0.
c. The standard states that this element specifies the magnification level which should be applied to a document when it is displayed by an application.
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Word 2013 ignores this element when reading a document.