in src/matrixDataviewHtmlFormatter.ts [59:74]
private static formatColumnNodes(root, levelToColumnNodesMap: any[][]): string {
let res = "";
for (let level = 0; level < levelToColumnNodesMap.length; level++) {
let levelNodes = levelToColumnNodesMap[level];
res += "<tr>";
res += "<th></th>";
for (let i = 0; i < levelNodes.length; i++) {
let node = levelNodes[i];
res += "<th colspan='" + node.leafCount + "' >";
res += node.isSubtotal ? "Totals" : node.value;
res += "</th>";
}
res += "</tr>";
}
return res;
}