How to Copy RTF to clipboard with Javascript

Let's say I have a simple rtf code like this:

{\rtf1\ansi\deff0 {\b Hello} World}

How would I use javascript to put it into my clipboard so that I could paste this into microsoft word?

I was trying this code to put it into the clipboard, but it puts the literal characters into the clipboard instead of interpreting it as rtf code:

function copyToClip(str) {
  function listener(e) {
    e.clipboardData.setData("text/rtf", str);
    e.preventDefault();
  }
  document.addEventListener("copy", listener);
  document.execCommand("copy");
  document.removeEventListener("copy", listener);
};