Make a Table

Size:

	1	2	3	4	5	6	7	8
1	1,1C1	1,2C2	1,3C3	1,4C4	1,5C5	1,6C6	1,7C7	1,8C8
2	2,1C9	2,2C10	2,3C11	2,4C12	2,5C13	2,6C14	2,7C15	2,8C16
3	3,1C17	3,2C18	3,3C19	3,4C20	3,5C21	3,6C22	3,7C23	3,8C24
4	4,1C25	4,2C26	4,3C27	4,4C28	4,5C29	4,6C30	4,7C31	4,8C32
5	5,1C33	5,2C34	5,3C35	5,4C36	5,5C37	5,6C38	5,7C39	5,8C40
6	6,1C41	6,2C42	6,3C43	6,4C44	6,5C45	6,6C46	6,7C47	6,8C48
7	7,1C49	7,2C50	7,3C51	7,4C52	7,5C53	7,6C54	7,7C55	7,8C56

2350 chars

Sample code

function makeRows(m, n) {
    let row = "<th></th>";
    for (let j = 1; j <= n; j++) 
        row += "<th>"+j+"</th>";
    let text = "<tr>"+row+"</tr>";
    for (let i = 1; i <= m; i++) {
       row = "<th>"+i+"</th>";
       for (let j = 1; j <= n; j++) {
          let p = n*(i-1)+j;
          let s = "<span class=tip>C"+p+"</span>"
          row += "<td>"+i+","+j+s+"</td>";
       }
       text += "<tr>"+row+"</tr>";
    }
    let t = text.length+" chars";
    console.log("makeRows: "+m+"x"+n+" "+t);
    tablo.innerHTML = text; out.innerText = t; 
}