get handlesAccessibility() {
    return /** @type {boolean} */ (this.config?.handlesAccessibility);
  }
For non `isTooltip`:
 - sets aria-expanded="true/false" and aria-haspopup="true" on invokerNode
 - sets aria-controls on invokerNode
 - returns focus to invokerNode on hide
 - sets focus to overlay content(?)

For `isTooltip`:
 - sets role="tooltip" and aria-labelledby/aria-describedby on the content

@type {boolean}