Classes and Attributes in Twig Templates for Drupal 8, 9, and 10

Theme developers often need to add or remove classes and other attributes from an HTML tag. Template files handle this with a special Attributes object that contains the attributes and their values, as well as a handful of powerful methods to help manage these attributes.

In this tutorial we’ll cover:

  • Adding/removing classes from elements in a Twig template
  • The attributes object
  • Examples of common tasks using various helper methods on the attributes object

Frontend Theming