| <!DOCTYPE html> |
| <title>Test that @container-dependent elements respond to container size changes</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| #container { |
| contain: size layout; |
| width: 200px; |
| height: 50px; |
| } |
| div { color: red; } |
| @container (min-width: 300px) { |
| div { color: green; } |
| } |
| </style> |
| <main id=container> |
| <div id=child> |
| Test |
| <p><span id=descendant>Deep</span></p> |
| </div> |
| </main> |
| <script> |
| test(function() { |
| assert_equals(getComputedStyle(child).color, 'rgb(255, 0, 0)'); |
| container.style.width = '300px'; |
| assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)'); |
| }, 'Children respond to changes in container size'); |
| |
| test(function() { |
| container.style = ''; |
| assert_equals(getComputedStyle(descendant).color, 'rgb(255, 0, 0)'); |
| container.style.width = '300px'; |
| assert_equals(getComputedStyle(descendant).color, 'rgb(0, 128, 0)'); |
| }, 'Descendants respond to changes in container size'); |
| </script> |