# Description

The vw unit is relative to the viewport's width. The viewport's width is equal to 100 'vw' units.

The format of this length value is a number followed by ‘vw’.

# Examples

This example defines a header with a font size proportional to the width of the viewport:

    h1 { font-size: 8vw }

# Browser Support

Firefox | IE | Chrome | Opera | Safari

# Miscellaneous Information

Defined In: | CSS3