void add(CellProperties cp) {
            if (cp.backgroundColor != null) backgroundColor = cp.backgroundColor;
            if (cp.colSpan != null) colSpan = cp.colSpan;
            if (cp.rowSpan != null) rowSpan = cp.rowSpan;
            if (cp.contentAlignment != null) contentAlignment = cp.contentAlignment;
            if (cp.allowLineBreaks != null) allowLineBreaks = cp.allowLineBreaks;
        }
Helper class in order to write HTML tables
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/status/statuspage/HtmlTable.java