Assertion:
Netscape does not seem to adjust the dimensions of an image if a LOWSRC attribute is also supplied, ie: The dimensions of the LOWSRC image are used to render the SRC image if no other HEIGHT and WIDTH properties have been set.

Reference Image (zenpattern.gif), default size:
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Reference Image (right.gif), default size:
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Test case with right.gif as the LOWSRC, and zenpattern.gif as the SRC. Dimensions of the image are different:
Click to see test case