JS simple christmas tree on one loop

I’m trying to make one loop christmas tree using string.repeat method.

  let Height = 6;
  let Star = "*";

  for (let i = 0; i < Height; i++) {
    for (let j = 0; j <= i; j++) {
      document.write(Star);
    }
    document.write("<br>");
  }

I’ve created it on 2 loops, but don’t know how to do it on a single one. Thank you for help.