Implement the augmentation to attr() specified in CSS Level 4, which allows types besides <string> and usage in all CSS properties (besides pseudo-element 'content'). Note: CSS Level 4 has made substantial revisions to attr() compared to Level 3 to ease the implementation. We'll following CSS4.


This is a highly requested feature, with 77 stars at We also want to keep it considered in the CR period by adding the first impelementation.


Editor's draft

Status in Chromium


In development (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.


Search tags

css, css-values, attr,

Last updated on 2021-07-25