or (let row = 0; row < df.nrow; row++) {
                let tr = document.createElement("tr");
                body.appendChild(tr)
                for (let i = 0; i < columns.length; i++) {
                    let cell = columns[i]
                    let td = document.createElement("td");
                    let colId = cell.id
                    let col = df.cols[colId]
                    let classes = (cell.leftBd ? " leftBorder" : "") + (cell.rightBd ? " rightBorder" : "")
                    if (co