| <!doctype html> |
| <title>Container Queries - Scrollbars do not cause transitions</title> |
| <link rel="help" href="https://drafts.csswg.org/css-transitions/#starting"> |
| <link rel="help" href="https://drafts.csswg.org/css-contain-3/#animated-containers"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="support/cq-testcommon.js"></script> |
| <style> |
| #scrollable { |
| overflow: auto; |
| width: 100px; |
| height: 100px; |
| } |
| #container { |
| container-type: inline-size; |
| } |
| #target { |
| background-color: black; |
| } |
| |
| /* Matches with or without a scrollbar: */ |
| @container (max-width: 100px) { |
| #target { |
| background-color: blue; |
| } |
| } |
| |
| /* Matches only when there's a scrollbar: */ |
| @container (max-width: 99px) { |
| #target { |
| background-color: green; |
| font-size: 10px; |
| transition: 2s steps(2, start) background-color; |
| } |
| } |
| </style> |
| <div id=scrollable> |
| <div id=container> |
| <div id=target> |
| Foo bar foo bar foo |
| Foo bar foo bar foo |
| Foo bar foo bar foo |
| Foo bar foo bar foo |
| Foo bar foo bar foo |
| </div> |
| </div> |
| </div> |
| <script> |
| setup(() => assert_implements_container_queries()); |
| |
| test(() => { |
| // Whether or not a scrollbar appeared is out of scope for this test. |
| // The only thing we care about is that no transition was triggered. |
| // Therefore we allow both 'green' and 'blue', but not any other values. |
| let has_scrollbar = target.offsetWidth < 100; |
| let expected = has_scrollbar ? 'rgb(0, 128, 0)' : 'rgb(0, 0, 255)'; |
| assert_equals(getComputedStyle(target).backgroundColor, expected); |
| }, 'Scrollbars do not cause a transition of background-color'); |
| </script> |
