All classes that implement PageVariantInterface in Drupal 9
- class \Drupal\Core\Render\Plugin\DisplayVariant\SimplePageVariant implements PageVariantInterface
- class \Drupal\block\Plugin\DisplayVariant\BlockPageVariant implements PageVariantInterface, ContainerFactoryPluginInterface
- class \Drupal\display_variant_test\Plugin\DisplayVariant\TestDisplayVariant implements ContextAwareVariantInterface, PageVariantInterface