IE6 supports! important when rule s! important is the last rule for this property in the selector.
This sounds a bit confusing, but if you declare an important height, this should be the last declaration for a "height" in this selector.
As such, consider the following examples:
#selector { height: 100px; height: 150px !important; }
Result: All browsers: 150px;
#selector { height: 100px; height: 150px !important; }
td#selector { height: 200px; }
Result: All browsers: 150px;
#selector { height: 100px; height: 150px; }
td#selector { height: 70px; height: 200px !important; }
Result: All browsers: 200px;
#selector { height: 100px !important; height: 150px; }
Result: All modern browsers but ie6: 100px; ie6: 150px;
#selector { height: 100px !important; height: 150px; }
td#selector { height: 200px; }
Result: All modern browsers but ie6: 100px; ie6: 200px;
#selector { height: 100px; height: 150px; }
td#selector { height: 70px !important; height: 200px; }
Result: All modern browsers but ie6: 70px; ie6: 200px;
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