CSSFunctionRule: getParameters() method

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The getParameters() method of the CSSFunctionRule interface returns an array of objects representing the custom function's parameters.

Syntax

js
getParameters()

Parameters

None.

Return value

An array of objects containing the following properties:

name

A string representing the name of the function parameter.

type

A string representing the data type of the parameter, or * if no data type was specified.

defaultValue

A string representing the default value of the parameter, or null if no default value was specified.

If no parameters were specified in the associated @function at-rule, an empty array is returned.

Examples

See the main CSSFunctionRule reference page for an example.

Specifications

Specification
CSS Functions and Mixins Module
# dom-cssfunctionrule-getparameters

Browser compatibility

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
getParameters
Experimental
Chrome – Full support
Chrome 139 (Release date: 2025-08-05)
footnote Full support
Edge – Full support
Edge 139 (Release date: 2025-08-07)
footnote Full support
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 123 (Release date: 2025-10-28)
footnote Full support
Safari – No support
Safari
footnote No support
Chrome Android – Full support
Chrome Android 139 (Release date: 2025-08-05)
footnote Full support
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – Full support
Opera Android 91 (Release date: 2025-08-19)
footnote Full support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – Full support
WebView Android 139 (Release date: 2025-08-05)
footnote Full support
WebView on iOS – No support
WebView on iOS
footnote No support

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also