addTable(rows) {
        const tableBody = rows
            .map(row => {
            const cells = row
                .map(cell => {
                if (typeof cell === 'string') {
                    return this.wrap('td', cell);
                }
                const { header, data, colspan, rowspan } = cell;
                const tag = header ? 'th' : 'td';
                const attrs = Object.assign(Object.assign({}, (colspan && { colspan })), (rowspan && { rowspan }));
                return this.wrap(tag, data, attrs);
            })
                .join('');
            return this.wrap('tr', cells);
        })
            .join('');
        const element = this.wrap('table', tableBody);
        return this.addRaw(element).addEOL();
    }
Adds an HTML table to the summary buffer

@param {SummaryTableCell[]} rows table rows

@returns {Summary} summary instance