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+---
+title: CSS, data attributes and feature flags
+date: 2024-08-25
+permalink: daily/2024/08/25/css--data-attributes-and-feature-flags
+tags:
+    - software-development
+    - drupal
+    - php
+    - feature-flags
+    - css
+cta: ~
+snippet: |
+    How I combined a feature flag and a data attribute to release some new CSS styles to a project.
+---
+
+I recently used [Drupal's Feature Toggle module](https://www.drupal.org/project/feature_toggle) to set a data attribute which enabled some new styling for buttons.
+
+Firstly, within the theme's .theme file, I added this code:
+
+```php
+/**
+ * Implements hook_preprocess_html().
+ */
+function mytheme_preprocess_html(array &$variables): void {
+  $variables['attributes']['data-use-new-button-styles'] = \Drupal::service('feature_toggle.feature_status')->getStatus('use_the_new_button_styling');
+}
+```
+
+If the feature toggle is enabled, it adds a `data-use-new-button-styles=""` attribute to the `body` element.
+
+If it is disabled, the attribute is not added, so I can write CSS that's applied when the data attribute is present:
+
+```css
+[data-use-new-button-styles] .btn-primary {
+  background-color: red;
+}
+```
+
+In a Tailwind CSS project (this isn't), the same could be achiveable with a custom interaction state - similar to `hover`, `focus` and `active`. Something like `new-button-styles:bg-red-500`.
+
+I like using feature flags and was happy to find a way to use them when adding this new CSS.