2.1.447 Part 1 Section 17.15.2.40, sz (Nested Frameset Size)
a. The standard allows any string for the val attribute.
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For the val attribute, Word allows an integer between 1 and 32,767 followed by *; an integer between 1 and 500 followed by %; or an integer which divided by pixelsPerInch gives a value between 0 and 22.
b. The standard states that no information shall be implied about the size of the current frameset when this element is omitted.
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Word implies that the size of the current frameset shall be a relative measurement with a value of 1 when the sz element is omitted.