'btn btn-primary']) ?>
'btn btn-success', 'onclick' => 'saveData()' ]) ?>In this example, the button() method generates an HTML button element with the label "Save" and the CSS class "btn btn-success". It also includes an onclick attribute that calls the saveData() JavaScript function. The yii\helpers\Html class is part of the Yii core package library. It provides a variety of convenient methods to generate and manipulate different HTML elements, making it easier for developers to create dynamic web applications.