CSSNumericValue: add() method

Limited availability

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

The add() method of the CSSNumericValue interface adds a supplied number to the CSSNumericValue.

Syntax

js
add(number)

Parameters

number

Either a number or a CSSNumericValue.

Return value

Exceptions

TypeError

Thrown if an invalid type was passed to the method.

Examples

js
let mathSum = CSS.px("23")
  .add(CSS.percent("4"))
  .add(CSS.cm("3"))
  .add(CSS.in("9"));
// Prints "calc(23px + 4% + 3cm + 9in)"
console.log(mathSum.toString());

Specifications

Specification
CSS Typed OM Level 1
# dom-cssnumericvalue-add

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
add

Legend

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

Full support
Full support
No support
No support
See implementation notes.