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

A CSSMathSum

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

BCD tables only load in the browser