peekaboo button web component

peekabooButton.js

  class Derp extends HTMLButtonElement {
    connectedCallback() {
      this.addEventListener('click', function () {
        this.style.display = "none";
        console.log(this.textContent + ' all gone...');
        this.doHide();
      });
    }

    doHide() {
      setTimeout(() => {
        console.log(this.textContent + ' peekaboo');
        this.style.display = "flow";
      }, "3000");
    }
  }

  customElements.define("x-derp", Derp, { extends: "button" });