Method togglePlaceholder

src/base-element.js:775–777

* Hides or shows the placeholder, if available. * @param {boolean} state * @public @final

(state)

   * @public @final
   */
  togglePlaceholder(state) {
    this.element.togglePlaceholder(state);
  }

  /**
   * Returns an optional fallback element for this custom element.