> ## Documentation Index > Fetch the complete documentation index at: https://dndkit.com/llms.txt > Use this file to discover all available pages before exploring further. # StyleInjector > Centralized style injection for drag and drop operations. ## Overview The `StyleInjector` plugin is the centralized style injection layer used by dnd-kit. It manages CSS rules that need to be present during drag operations, handling injection into both `Document` and `ShadowRoot` contexts. This plugin is always included automatically — you do not need to add it to your plugins array. ## How It Works Other plugins (such as [Feedback](/extend/plugins/feedback)) register CSS rules with the `StyleInjector`. During a drag operation, the `StyleInjector` automatically injects those rules into the relevant document and shadow roots, and cleans them up when the operation ends. ### Document Roots For `Document` roots, CSS is injected via a `