CSS numeric factory functions

Experimental

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

The CSS numeric factory functions, such as CSS.em() and CSS.turn() are methods that return CSSUnitValues with the value being the numeric argument and the unit being the name of the method used. These functions create new numeric values less verbosely than using the CSSUnitValue.CSSUnitValue() constructor.

Syntax

CSS.number(number);
CSS.percent(number);

// <length>
CSS.em(number);
CSS.ex(number);
CSS.ch(number);
CSS.ic(number);
CSS.rem(number);
CSS.lh(number);
CSS.rlh(number);
CSS.vw(number);
CSS.vh(number);
CSS.vi(number);
CSS.vb(number);
CSS.vmin(number);
CSS.vmax(number);
CSS.cm(number);
CSS.mm(number);
CSS.Q(number);
CSS.in(number);
CSS.pt(number);
CSS.pc(number);
CSS.px(number);

// <angle>
CSS.deg(number);
CSS.grad(number);
CSS.rad(number);
CSS.turn(number);

// <time>
CSS.s(number);
CSS.ms(number);

// <frequency>
CSS.Hz(number);
CSS.kHz(number);

// <resolution>
CSS.dpi(number);
CSS.dpcm(number);
CSS.dppx(number);

// <flex>
CSS.fr(number);

Examples

We use the CSS.vmax() numeric factory function to create a CSSUnitValue:

let height = CSS.vmax(50);

console.log( height );       // CSSUnitValue {value: 50, unit: "vmax"}
console.log( height.value )  // 50
console.log( height.unit )   // vmax

In this example, we set the margin on our element using the CSS.px() factory function:

myElement.attributeStyleMap.set('margin', CSS.px(40));
let currentMargin = myElement.attributeStyleMap.get('margin');
console.log(currentMargin.value, currentMargin.unit); // 40, 'px'

Specifications

Specification Status Comment
CSS Object Model (CSSOM)
The definition of 'Numeric Factory Functions' in that specification.
Working Draft Initial definition

Browser compatibility

BCD tables only load in the browser

See also