The CSSRule
interface represents a single CSS rule. There are several types of rules, listed in the Type constants section below.
The CSSRule
interface specifies the properties common to all rules, while properties unique to specific rule types are specified in the more specialized interfaces for those rules' respective types.
References to a CSSRule
may be obtained by looking at a CSSStyleSheet
's cssRules
list.
Properties common to all CSSRule instances
CSSRule.cssText
- Represents the textual representation of the rule, e.g. "
h1,h2 { font-size: 16pt }
" or "@import 'url'
". To access or modify parts of the rule (e.g. the value of "font-size" in the example) use the properties on the specialized interface for the rule's type. CSSRule.parentRule
Read only- Returns the containing rule, otherwise
null
. E.g. if this rule is a style rule inside an@media
block, the parent rule would be thatCSSMediaRule
. CSSRule.parentStyleSheet
Read only- Returns the
CSSStyleSheet
object for the style sheet that contains this rule CSSRule.type
Read only- One of the Type constants indicating the type of CSS rule.
Constants
Type constants
The CSSRule
interface specifies integer constants that can be used in conjunction with a CSSRule
's type
property to discern the rule type (and therefore, which specialized interface it implements). The relationships between these constants and the interfaces are:
Type | Value | Rule-specific interface | Comments and examples |
CSSRule.STYLE_RULE
|
1
|
CSSStyleRule
|
The most common kind of rule:
|
CSSRule.IMPORT_RULE
|
3
|
CSSImportRule
|
An @import rule. (Until the documentation is completed, see the interface definition in the Mozilla source code: nsIDOMCSSImportRule.)
|
CSSRule.MEDIA_RULE
|
4
|
CSSMediaRule
|
|
CSSRule.FONT_FACE_RULE
|
5
|
CSSFontFaceRule
|
|
CSSRule.PAGE_RULE
|
6
|
CSSPageRule
|
|
CSSRule.KEYFRAMES_RULE
|
7
|
CSSKeyframesRule '
|
|
CSSRule.KEYFRAME_RULE
|
8
|
CSSKeyframeRule '
|
|
Reserved for future use | 9
|
Should be used to define color profiles in the future | |
CSSRule.NAMESPACE_RULE
|
10
|
CSSNamespaceRule '
|
|
CSSRule.COUNTER_STYLE_RULE
|
11
|
CSSCounterStyleRule '
|
|
CSSRule.SUPPORTS_RULE
|
12
|
CSSSupportsRule
|
|
CSSRule.DOCUMENT_RULE
|
13
|
CSSDocumentRule '
|
|
CSSRule.FONT_FEATURE_VALUES_RULE
|
14
|
CSSFontFeatureValuesRule
|
|
CSSRule.VIEWPORT_RULE
|
15
|
CSSViewportRule '
|
|
CSSRule.REGION_STYLE_RULE
|
16
|
CSSRegionStyleRule '
|
|
CSSRule.UNKNOWN_RULE
|
0
|
CSSUnknownRule '
|
|
CSSRule.CHARSET_RULE
|
2
|
CSSCharsetRule '
|
(Removed in most browsers.) |
An up-to-date informal list of constants can be found on the CSSWG Wiki.
Specifications
Specification | Status | Comment |
---|---|---|
CSS Object Model (CSSOM)The definition of 'CSSRule' in that specification. | Working Draft | Obsoleted values CHARSET_RULE and UNKNOWN_RULE . Added value NAMESPACE_RULE .
|
CSS AnimationsThe definition of 'CSSRule' in that specification. | Working Draft | Added values KEYFRAMES_RULE and KEYFRAME_RULE .
|
CSS Fonts Module Level 4The definition of 'CSSRule' in that specification. | Working Draft | Added value FONT_FEATURE_VALUES_RULE .
|
CSS Counter Styles Level 3The definition of 'CSSRule' in that specification. | Candidate Recommendation | Added value COUNTER_STYLE_RULE .
|
CSS Conditional Rules Module Level 3The definition of 'CSSRule' in that specification. | Candidate Recommendation | Added value SUPPORTS_RULE . (DOCUMENT_RULE has been pushed to CSS Conditional Rules Level 4)
|
Document Object Model (DOM) Level 2 Style SpecificationThe definition of 'CSSRule' in that specification. | Obsolete | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
CSSRule
|
Chrome
Full support 1 |
Edge
Full support 12 |
Firefox
Full support 1 |
IE
Full support 9 |
Opera
Full support Yes |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support 18 |
Firefox Android
Full support 4 |
Opera Android
Full support Yes |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 1.0 |
cssText
|
Chrome
Full support 1 |
Edge
Full support 12 |
Firefox
Full support 1 |
IE Full support Yes Full support Yes Notes' The property normalizes rules and does not return the original verbatim rule text. For example, |
Opera
Full support Yes |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support 18 |
Firefox Android
Full support 4 |
Opera Android
Full support Yes |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 1.0 |
parentRule
|
Chrome
Full support 1 |
Edge
Full support 12 |
Firefox
Full support 1 |
IE
? |
Opera
Full support Yes |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support 18 |
Firefox Android
Full support 4 |
Opera Android
Full support Yes |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 1.0 |
parentStyleSheet
|
Chrome
Full support 1 |
Edge
Full support 12 |
Firefox
Full support 1 |
IE
? |
Opera
Full support Yes |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support 18 |
Firefox Android
Full support 4 |
Opera Android
Full support Yes |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 1.0 |
type
|
Chrome
Full support 1 |
Edge
Full support 12 |
Firefox
Full support 1 |
IE
? |
Opera
Full support Yes |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support 18 |
Firefox Android
Full support 4 |
Opera Android
Full support Yes |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 1.0 |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
- See implementation notes.'
- See implementation notes.
See also
CSSRule by Mozilla Contributors is licensed under CC-BY-SA 2.5.