| <!DOCTYPE html> |
| <title>Test that rem units are responsive to transitioning font-size on root</title> |
| <link rel="help" href="https://drafts.csswg.org/css-transitions/"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| :root { |
| font-size: 10px; |
| transition: font-size steps(2, start) 10s; |
| } |
| :root.change { |
| font-size: 20px; |
| } |
| |
| #target1 { |
| width: 1rem; |
| } |
| </style> |
| <div id="target1"></div> |
| <output id=output></output> |
| <script> |
| test(() => { |
| let unused = getComputedStyle(document.documentElement).getPropertyValue('font-size'); |
| document.documentElement.className = 'change'; |
| assert_equals(getComputedStyle(target1).getPropertyValue('width'), '15px'); |
| }, 'Transitioning font-size on root affects rem units'); |
| </script> |
