The read-only style property is the CSSStyleDeclaration interface for the declaration block of the CSSStyleRule.


styleObj = cssRule.style


A CSSStyleDeclaration object, with the following properties:

computed flag
The declared declarations in the rule, in the order they were specified, shorthand properties expanded to longhands.
parent CSS rule
The context object, which is an alias for this.
owner node


The CSS includes one style rule. This will be the first CSSRule returned by document.styleSheets[0].cssRules. myRules[0].style therefore returns a CSSStyleDeclaration object representing the declarations defined for h1.

h1 {
  color: pink;
let myRules = document.styleSheets[0].cssRules;
console.log(myRules[0].style); // a CSSStyleDeclaration representing the declarations on the h1.

The declaration block is that part of the style rule that appears within the braces and that actually provides the style definitions (for the selector, the part that comes before the braces).


Specification Status Comment
CSS Object Model (CSSOM)
The definition of 'CSSStyleRule: style' in that specification.
Working Draft

Browser compatibility

BCD tables only load in the browser