var()

var() is a CSS function in the Functions category. Uses the value of a custom CSS property. The syntax is var(--<name>, <fallback>?). A typical example: color: var(--primary, #333); It is commonly applied to markup such as <div class="demo">Sample</div> Browser support: Chrome 49+, Firefox 31+, Safari 9.1+, Edge 15+. A close relative is calc(), which performs mathematical calculations with mixed units. A close relative is min(), which selects the smallest value from a list. A close relative is max(), which selects the largest value from a list. More about this category: CSS functions — calc(), var(), clamp(), min(), max() and more. Related Functions entries: calc(), min(), max(), clamp(), env(), url(), attr(), rgb() / rgba(). This page is part of the free CSS Reference documentation covering 841+ properties, selectors, functions, and at-rules, each with syntax, values, examples, and browser support.