CSSStyleDeclaration

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

The CSSStyleDeclaration interface represents an object that is a CSS declaration block, and exposes style information and various style-related methods and properties.

A CSSStyleDeclaration object can be exposed using three different APIs:

Via HTMLElement.style, which deals with the inline styles of a single element (e.g., <div style="…">).
Via the CSSStyleSheet API. For example, document.styleSheets[0].cssRules[0].style returns a CSSStyleDeclaration object on the first CSS rule in the document's first stylesheet.
Via Window.getComputedStyle(), which exposes the CSSStyleDeclaration object as a read-only interface.

Attributes

CSSStyleDeclaration.cssText: Textual representation of the declaration block, if and only if it is exposed via HTMLElement.style. Setting this attribute changes the inline style. If you want a text representation of a computed declaration block, you can get it with JSON.stringify().
CSSStyleDeclaration.length Read only: The number of properties. See the item() method below.
CSSStyleDeclaration.parentRule Read only: The containing CSSRule.

CSS Properties

CSSStyleDeclaration.cssFloat: Special alias for the float CSS property.
CSSStyleDeclaration named properties: Dashed and camel-cased attributes for all supported CSS properties.

Instance methods

CSSStyleDeclaration.getPropertyPriority(): Returns the optional priority, "important".
CSSStyleDeclaration.getPropertyValue(): Returns the property value given a property name.
CSSStyleDeclaration.item(): Returns a CSS property name by its index, or the empty string if the index is out-of-bounds.
CSSStyleDeclaration.removeProperty(): Removes a property from the CSS declaration block.
CSSStyleDeclaration.setProperty(): Modifies an existing CSS property or creates a new CSS property in the declaration block.
CSSStyleDeclaration.getPropertyCSSValue() Deprecated: Only supported via getComputedStyle in Firefox. Returns the property value as a CSSPrimitiveValue or null for shorthand properties.

Example

const styleObj = document.styleSheets[0].cssRules[0].style;
console.log(styleObj.cssText);

for (let i = styleObj.length; i--; ) {
  const nameString = styleObj[i];
  styleObj.removeProperty(nameString);
}

console.log(styleObj.cssText);

Specifications

Specification
CSS Object Model (CSSOM) # the-cssstyledeclaration-interface

Browser compatibility

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