attr()

attr() is a CSS function in the Functions category. Returns the value of an HTML attribute as a CSS string. The syntax is attr(<attr-name> <type>?). A typical example: content: attr(data-tooltip); It is commonly applied to markup such as <div class="demo">Sample</div> Browser support: Chrome 1+, Firefox 1+, Safari 1+, Edge 12+. 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(), var(), env(), url(), 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.