static get _keyboardManager() {
    const proto = HighlightEditor.prototype;
    return shadow(
      this,
      "_keyboardManager",
      new KeyboardManager([
        [["ArrowLeft", "mac+ArrowLeft"], proto._moveCaret, { args: [0] }],
        [["ArrowRight", "mac+ArrowRight"], proto._moveCaret, { args: [1] }],
        [["ArrowUp", "mac+ArrowUp"], proto._moveCaret, { args: [2] }],
        [["ArrowDown", "mac+ArrowDown"], proto._moveCaret, { args: [3] }],
      ])
    );
  }
Basic draw editor in order to generate an Highlight annotation.