SOURCE

const container = document.getElementById('container')
for(let i = 1; i <= 9; i++) {
    let tr = document.createElement('tr')
    for(let j = 1; j <= i; j++) {
        let td = document.createElement('td')
        td.innerHTML = `${j} * ${i} = ${j*i}`
        tr.appendChild(td)
    }
    container.appendChild(tr)
}

<table class="tb" id="container" border="1">

</table>

.tb {
    border-collapse: collapse;
    border: 0 solid gray;
}