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CSS3 attr() function for all properties

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CSS

While `attr()` is supported for effectively all browsers for the `content` property, CSS Values and Units Level 3 adds the ability to use `attr()` on **any** CSS property, and to use it for non-string values (e.g. numbers, colors).

Further reading:

  1. Can I use page for: CSS3 attr() function for all properties
  2. MDN Web Docs - CSS attr
  3. Microsoft Edge feature request on UserVoice
  4. Mozilla Bug #435426: implement css3-values extensions to `attr()`
  5. Chromium issue #246571: Implement CSS3 attribute / attr references
  6. WebKit Bug #26609: Support CSS3 attr() function