<number> | CSS Types & Functions

A CSS data type representing a real number (which can include decimals). It's used for values like 'opacity', 'line-height' (as a multiplier), or in math functions.

Quick example

.semi-transparent {
  /* Uses a number for opacity */
  opacity: 0.5;
  /* Uses a number as a multiplier for line-height */
  line-height: 1.6;
}

<number> Browser Support

Widely available Since 2015 96% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.

Safe to use without fallbacks.

View on caniuse.com → View on MDN → View on webstatus.dev → View spec → Learn more about Baseline →

12+