{{ CSSOMRef() }}
Summary
A CSSStyleDeclaration is an interface to the declaration block returned by the style property of a cssRule in a stylesheet, when the rule is a CSSStyleRule.
CSSStyleDeclaration is also a read-only interface to the result of getComputedStyle.
Attributes
cssText
Textual representation of the declaration block. Setting this attribute changes the style.
length
The number of properties. See the item method below.
parentRule
The containing cssRule.
Methods
getPropertyPriority(propertyName)
Returns the optional priority, "important".
Example: priString= styleObj.getPropertyPriority('color')
getPropertyValue(propertyName)
Returns the property value.
Example: valString= styleObj.getPropertyValue('color')
item(index)
Returns a property name.
Example: nameString= styleObj.item(0)
Alternative: nameString= styleObj[0]
removeProperty(propertyName)
Returns the value deleted.
Example: valString= styleObj.removeProperty('color')
setProperty(propertyName, value, priority)
No return.
Example: styleObj.setProperty('color', 'red', 'important')
getPropertyCSSValue(propertyName)
Only supported via getComputedStyle.
Returns an {{ domxref("ROCSSPrimitiveValue") }} in Firefox ({{ domxref("CSSPrimitiveValue") }}, in others, which implements CSSValue), or null for Shorthand properties.
Example: cssString= window.getComputedStyle(elem, null).getPropertyCSSValue('color').cssText;
Note: Gecko 1.9 returns null unless using getComputedStyle().
Note: This method may be deprecated by the W3C , and it is not present in the latest CSSOM draft. It is not supported by IE and even though the function exists in Opera, calling it throws a {{ domxref("DOMException") }} NOT_SUPPORTED_ERR.
Example
var styleObj= document.styleSheets[0].cssRules[0].style;
alert(styleObj.cssText);
for (var i = styleObj.length-1; i >= 0; i--) {
var nameString = styleObj[i];
styleObj.removeProperty(nameString);
}
alert(styleObj.cssText);
Notes
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).