<length> | CSS Types & Functions

A CSS data type representing a distance value. It consists of a number followed by a unit (like 'px', 'em', 'rem', 'vw', etc.).

Quick example

h1 {
  /* Uses various length units */
  font-size: 2.5rem;
  margin-top: 20px;
  width: 50vw;
}

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.

12+