Assertion:
Setting either of the WIDTH or HEIGHT attributes to zero does strange things. In Netscape 4, this causes the image to be displayed at its natural dimensions. In Internet Explorer 4 the image disappears. The odd thing is, in previous versions of these browsers the behavior is reversed.

Simple IMG reference (left.gif):
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IMG reference (left.gif) with dimensions enlarged (height=50, width=50):
filler text filler text

IMG reference (left.gif) with dimensions set to height=0, width=0:
filler text filler text

IMG reference (left.gif) with dimensions set to height=0, width=50:
filler text filler text

IMG reference (left.gif) with dimensions set to height=50, width=0:
filler text filler text

IMG reference (left.gif) with dimensions set to height=0, no width attribute specified:
filler text filler text

IMG reference (left.gif) with dimensions set to width=0, no height attribute specified:
filler text filler text