table.cell.border.color not applied in HTML output

table.cell.border.color doesn't applied in HTML output. However, it is displaying the expected
color in FO. The parameter exists in HTML as it is showing here
http://docbook.sourceforge.net/release/xsl/current/doc/html/table.cell.border.color.html.

Here is my common customization layer:
<?xml version='1.0'?>
<xsl:stylesheet  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
	<xsl:param name="table.cell.border.color">orange</xsl:param>
</xsl:stylesheet> 


Does someone know what I did wrong?

thx!
Xuan.


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