difference between keydown keypress and keyup code example

Example 1: keydown events

eventTarget.addEventListener("keydown", event => {
  if (event.isComposing || event.keyCode === 229) {
    return;
  }
  // do something
});

Example 2: what is keyup and keydown

Keydown and keyup. The keydown events happens when a key is pressed down, and then keyup – when it's released