SOURCE

let table = document.querySelector('.container')
        for (let i = 1; i <= 9; i++) {
            let col = document.createElement('div')
            for (let j = i; j <= 9; j++) {
                let cell = document.createElement('div')
                cell.innerText = `${i}x${j}=${i*j}`
                cell.style.border = '1px solid black'
                col.appendChild(cell)
            }
            table.appendChild(col)
        }

<div class="container"></div>

.container {
            display: flex;
            align-items: flex-end;
        }