| <!DOCTYPE html> |
| <title>@container-dependent elements respond to size changes of an @container-dependent iframe</title> |
| <link rel="help" href="https://drafts.csswg.org/css-contain-3/#size-container"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="support/cq-testcommon.js"></script> |
| <style> |
| #container { |
| container-type: size; |
| width: 200px; |
| height: 200px; |
| } |
| iframe { |
| width: 200px; |
| height: 40px; |
| } |
| @container (width > 300px) { |
| iframe { width: 400px; } |
| } |
| </style> |
| <div id=container> |
| <iframe id=iframe srcdoc=" |
| <style> |
| div#container { |
| container-type: size; |
| height: 20px; |
| } |
| div#child { color: red; } |
| @container (width > 300px) { |
| div#child { color: green; } |
| } |
| </style> |
| <div id=container> |
| <div id=child>Test</div> |
| </div> |
| "></iframe> |
| </div> |
| <script> |
| setup(() => assert_implements_container_queries()); |
| |
| function waitForLoad(w) { |
| return new Promise(resolve => w.addEventListener('load', resolve)); |
| } |
| |
| promise_test(async () => { |
| await waitForLoad(window); |
| let inner_div = iframe.contentDocument.querySelector('div#child'); |
| assert_equals(getComputedStyle(inner_div).color, 'rgb(255, 0, 0)'); |
| |
| // Changing the size of the outer container changes the size of the iframe, |
| // which in turn should change the size of the inner container (inside that |
| // iframe). |
| container.style.width = '400px'; |
| container.style.setProperty('--x', 'x'); // crbug.com/1312940 |
| |
| assert_equals(getComputedStyle(inner_div).color, 'rgb(0, 128, 0)'); |
| }); |
| </script> |
