| <!DOCTYPE html> |
| <title>@container: scroll-state(scrollable) matching viewport for root element</title> |
| <link rel="help" href="https://drafts.csswg.org/css-conditional-5/#scrollable"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script> |
| <script src="/css/css-transitions/support/helper.js"></script> |
| <style> |
| :root { |
| container-type: scroll-state; |
| } |
| #target { |
| height: 5000px; |
| --top: no; |
| --bottom: no; |
| @container scroll-state(scrollable: top) { |
| --top: yes; |
| } |
| @container scroll-state(scrollable: bottom) { |
| --bottom: yes; |
| } |
| } |
| </style> |
| <div id="target"></div> |
| <script> |
| setup(() => assert_implements_scroll_state_container_queries()); |
| |
| const root = document.documentElement; |
| |
| promise_test(async t => { |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no"); |
| assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "yes"); |
| assert_equals(root.scrollTop, 0); |
| }, "Check that scroll-state(scrollable) matches bottom before scroll"); |
| |
| promise_test(async t => { |
| root.scrollTop = 100; |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target).getPropertyValue("--top"), "yes"); |
| assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "yes"); |
| }, "Check that scroll-state(scrollable) matches both top and bottom in a middle position"); |
| |
| promise_test(async t => { |
| root.scrollTop = 5000; |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target).getPropertyValue("--top"), "yes"); |
| assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no"); |
| }, "Check that scroll-state(scrollable) matches both top when scrolled to the end"); |
| |
| </script> |
