---
title: CSSRule Additions Reference
framework: webkitjs
role: collectionGroup
role_heading: API Collection
path: webkitjs/cssrule_additions_reference
---

# CSSRule Additions Reference

These extensions to the CSSRule class are used to access animation keyframe and keyframes rules.

## Topics

### Constants

- [WEBKIT_KEYFRAMES_RULE](webkitjs/cssrule/1632070-webkit_keyframes_rule.md)
- [WEBKIT_KEYFRAME_RULE](webkitjs/cssrule/1633440-webkit_keyframe_rule.md)