CSSStyleDeclaration.getPropertyPriority()

The CSSStyleDeclaration.getPropertyPriority() method interface returns a DOMString that provides all explicitly set priorities on the CSS property.

• property is a DOMString representing the property name to be checked.

• priority is a DOMString that represents the priority (e.g. "important") if one exists. If none exists, returns the empty string.

The following JavaScript code checks whether margin is marked as important in a CSS selector rule:

var declaration = document.styleSheets[0].cssRules[0].style;
var isImportant = declaration.getPropertyPriority('margin') === 'important';