src/Widgets/Bootstrap/Tabs.php
public function init()
    {
        parent::init();
        $this->options['role'] = 'tablist';
        Html::addCssClass($this->options, ['widget' => 'nav', $this->navType]);
        Html::addCssClass($this->tabContentOptions, 'tab-content');
        Html::addCssClass($this->headerOptions, 'nav-item');
        Html::addCssClass($this->linkOptions, 'nav-link');
    }
public function init()
    {
        parent::init();
        $this->options['role'] = 'tablist';
        Html::addCssClass($this->options, ['widget' => 'nav', $this->navType]);
        Html::addCssClass($this->tabContentOptions, 'tab-content');
        Html::addCssClass($this->headerOptions, 'nav-item');
        Html::addCssClass($this->linkOptions, 'nav-link');
    }
Initializes the widget.