| <!doctype html> |
| <meta charset="utf-8"> |
| <title>Container Queries - Style Change Event for transitions</title> |
| <link rel="help" href="https://drafts.csswg.org/css-transitions/#starting"> |
| <link rel="help" href="https://drafts.csswg.org/css-conditional-5/#animated-containers"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="support/cq-testcommon.js"></script> |
| <style> |
| .container { |
| container-type: inline-size; |
| } |
| #outer { |
| width: 100px; |
| color: green; |
| } |
| #target { |
| transition: color 100s step-end; |
| } |
| |
| @container (min-width: 200px) { |
| #inner { color: red; } |
| } |
| @container (min-width: 200px) { |
| #target { |
| /* This rule exists just to have a container query dependency between |
| target and #inner */ |
| background-color: orange; |
| } |
| } |
| </style> |
| <div id="outer" class="container"> |
| <div id="inner" class="container"> |
| <div id="target">Green</div> |
| </div> |
| </div> |
| <script> |
| setup(() => assert_implements_size_container_queries()); |
| |
| test(() => { |
| outer.offsetTop; |
| outer.style.width = "200px"; |
| assert_equals(getComputedStyle(target).color, "rgb(0, 128, 0)"); |
| }, "#inner color change to red triggers a step transition starting at green"); |
| </script> |
