index.md

---
title: CSSStartingStyleRule
slug: Web/API/CSSStartingStyleRule
page-type: web-api-interface
browser-compat: api.CSSStartingStyleRule
---

{{ APIRef("CSSOM") }}

The **`CSSStartingStyleRule`** interface of the [CSS Object Model](/en-US/docs/Web/API/CSS_Object_Model) represents a CSS {{CSSxRef("@starting-style")}} at-rule.

{{InheritanceDiagram}}

## Instance properties

_Inherits properties from its ancestors {{domxref("CSSGroupingRule")}} and {{domxref("CSSRule")}}._

## Instance methods

_Inherits methods from its ancestors {{domxref("CSSGroupingRule")}} and {{domxref("CSSRule")}}._

## Specifications

{{Specifications}}

## Browser compatibility

{{Compat}}

## See also

- {{CSSxRef("@starting-style")}}
- [CSS transitions](/en-US/docs/Web/CSS/CSS_transitions) module
- [Using dynamic styling information](/en-US/docs/Web/API/CSS_Object_Model/Using_dynamic_styling_information)