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These CSS1 properties or selectors do not work in Netscape Navigator 4, and should be avoided:

background-attachment
background-position
border-top, border-left, border-bottom, border-right (use other border-* properties instead)
display (except display:none)
font-variant
letter-spacing
list-style-image, list-style-position
vertical-align
word-spacing
white-space:nowrap
the !important declaration
the @import statement
:first-line and :first-letter pseudo-elements.