CSSRule (Common DOM API )
Keywords: org.w3c.dom.css.CSSRule interface
Date: 2026-03-16

compact2, compact3
org.w3c.dom.css

## Interface CSSRule

- All Known Subinterfaces:
    CSSCharsetRule, CSSFontFaceRule, CSSImportRule, CSSMediaRule, CSSPageRule, CSSStyleRule, CSSUnknownRule

      public interface CSSRule

  The `CSSRule` interface is the abstract base interface for any type of CSS statement. This includes both rule sets and at-rules. An implementation is expected to preserve all rules specified in a CSS style sheet, even if the rule is not recognized by the parser. Unrecognized rules are represented using the `CSSUnknownRule` interface.

  See also the Document Object Model (DOM) Level 2 Style Specification.

  Since:
    DOM Level 2

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static short` | `CHARSET_RULE` The rule is a `CSSCharsetRule`.
    `static short` | `FONT_FACE_RULE` The rule is a `CSSFontFaceRule`.
    `static short` | `IMPORT_RULE` The rule is a `CSSImportRule`.
    `static short` | `MEDIA_RULE` The rule is a `CSSMediaRule`.
    `static short` | `PAGE_RULE` The rule is a `CSSPageRule`.
    `static short` | `STYLE_RULE` The rule is a `CSSStyleRule`.
    `static short` | `UNKNOWN_RULE` The rule is a `CSSUnknownRule`.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `getCssText()` The parsable textual representation of the rule.
    `CSSRule` | `getParentRule()` If this rule is contained inside another rule (e.g.
    `CSSStyleSheet` | `getParentStyleSheet()` The style sheet that contains this rule.
    `short` | `getType()` The type of the rule, as defined above.
    `void` | `setCssText(String cssText)` The parsable textual representation of the rule.

- - ### Field Detail

    - #### UNKNOWN_RULE

          static final short UNKNOWN_RULE

      The rule is a `CSSUnknownRule`.
      See Also:
        Constant Field Values

    - #### STYLE_RULE

          static final short STYLE_RULE

      The rule is a `CSSStyleRule`.
      See Also:
        Constant Field Values

    - #### CHARSET_RULE

          static final short CHARSET_RULE

      The rule is a `CSSCharsetRule`.
      See Also:
        Constant Field Values

    - #### IMPORT_RULE

          static final short IMPORT_RULE

      The rule is a `CSSImportRule`.
      See Also:
        Constant Field Values

    - #### MEDIA_RULE

          static final short MEDIA_RULE

      The rule is a `CSSMediaRule`.
      See Also:
        Constant Field Values

    - #### FONT_FACE_RULE

          static final short FONT_FACE_RULE

      The rule is a `CSSFontFaceRule`.
      See Also:
        Constant Field Values

    - #### PAGE_RULE

          static final short PAGE_RULE

      The rule is a `CSSPageRule`.
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### getType

          short getType()

      The type of the rule, as defined above. The expectation is that binding-specific casting methods can be used to cast down from an instance of the `CSSRule` interface to the specific derived interface implied by the `type`.

    - #### getCssText

          String getCssText()

      The parsable textual representation of the rule. This reflects the current state of the rule and not its initial value.

    - #### setCssText

          void setCssText(String cssText)
                   throws DOMException

      The parsable textual representation of the rule. This reflects the current state of the rule and not its initial value.
      Throws:
        `DOMException` - SYNTAX_ERR: Raised if the specified CSS string value has a syntax error and is unparsable.
        INVALID_MODIFICATION_ERR: Raised if the specified CSS string value represents a different type of rule than the current one.
        HIERARCHY_REQUEST_ERR: Raised if the rule cannot be inserted at this point in the style sheet.
        NO_MODIFICATION_ALLOWED_ERR: Raised if the rule is readonly.

    - #### getParentStyleSheet

          CSSStyleSheet getParentStyleSheet()

      The style sheet that contains this rule.

    - #### getParentRule

          CSSRule getParentRule()

      If this rule is contained inside another rule (e.g. a style rule inside an @media block), this is the containing rule. If this rule is not nested inside any other rules, this returns `null`.

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