Method enable

src/js/tether.js:239–256

(pos = true)

  }

  enable(pos = true) {
    const { classes, classPrefix } = this.options;
    if (!(this.options.addTargetClasses === false)) {
      addClass(this.target, getClass('enabled', classes, classPrefix));
    }
    addClass(this.element, getClass('enabled', classes, classPrefix));
    this.enabled = true;

    this.scrollParents.forEach((parent) => {
      if (parent !== this.target.ownerDocument) {
        parent.addEventListener('scroll', this.position);
      }
    });

    if (pos) {
      this.position();
    }
  }

  disable() {
    const { classes, classPrefix } = this.options;