A CSS declaration is an abstract concept not exposed as an object in the DOM. It represents a CSS property and value pairing.

A CSS declaration has the following associated properties:

• property name

  • : The property name of the declaration, for example .

  value

  • : The value of the declaration as a list of component values.

  important flag

  • : Either set or unset.

  case-sensitive flag

  • : Set if the property name is defined to be case-sensitive according to the specification, otherwise unset.

Basic example

The following example shows a CSS rule with a CSS declaration block for the <h1> element. The CSS declaration block is the lines between the curly braces, it contains two CSS declarations. One for and another for .

h1 {
  font-style: italic;
  color: rebeccapurple;
}

Specifications