SOURCE

document.write("<table>");
for(var row = 1; row < 10; row++) {
    document.write("<tr>");
    for(var column = 1; column <= row; column++) {
        document.write("<td>" + column + "x" + row + "=" + column * row + "</td>");
    }
    document.write("</tr>");
}
document.write("</table>");

table td{
    border: 1px solid skyblue;
}