CSSStyleDeclaration

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. Setting this attribute changes the style.
CSSStyleDeclaration.lengthRead only
The number of properties. See the item() method below.
CSSStyleDeclaration.parentRuleRead 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.

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.
An alternative to accessing nodeList[i] (which instead returns undefined when i is out-of-bounds). This is mostly useful for non-JavaScript DOM implementations.
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() 
Only supported via getComputedStyle in Firefox. Returns the property value as a CSSPrimitiveValue or null for shorthand properties.

Example

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

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

console.log(styleObj.cssText);

Specifications

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

Browser compatibility

BCD tables only load in the browser

See also