| <!DOCTYPE html> |
| <title>@container: scroll-state(snapped) matches for scrollchanging</title> |
| <link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-rule"> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#snap-events"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/resources/testdriver.js"></script> |
| <script src="/resources/testdriver-actions.js"></script> |
| <script src="/resources/testdriver-vendor.js"></script> |
| <script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script> |
| <script src="/css/css-transitions/support/helper.js"></script> |
| <style> |
| html { scroll-snap-type: block mandatory; } |
| body { margin: 0; } |
| #filler { height: 10000px; } |
| .snapped { |
| container-type: scroll-state; |
| scroll-snap-align: start; |
| width: 100px; |
| height: 100px; |
| } |
| @container scroll-state(snapped: block) { |
| span { --snapped: true; } |
| } |
| </style> |
| <div id="snapped1" class="snapped"> |
| <span id="target1"></span> |
| </div> |
| <div id="snapped2" class="snapped"> |
| <span id="target2"></span> |
| </div> |
| <div id="filler"></div> |
| <script> |
| setup(() => assert_implements_scroll_state_container_queries()); |
| |
| let changeTarget; |
| let changingTarget; |
| |
| window.addEventListener("scrollsnapchange", e => changeTarget = e.snapTargetBlock); |
| window.addEventListener("scrollsnapchanging", e => changingTarget = e.snapTargetBlock); |
| |
| promise_test(async t => { |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target1).getPropertyValue("--snapped"), "true"); |
| assert_equals(getComputedStyle(target2).getPropertyValue("--snapped"), ""); |
| assert_equals(changeTarget, snapped1, "snapchange has been called for #snapped1"); |
| assert_equals(changingTarget, undefined, "snapchanging has not been called"); |
| assert_equals(window.scrollY, 0); |
| }, "Initially snapped to #snapped1, scroll-state() styling #target1") |
| |
| promise_test(async t => { |
| await new test_driver.Actions() |
| .addPointer("pointer1", "touch") |
| .pointerMove(0, 200, {origin: "viewport"}) |
| .pointerDown() |
| .pause(50) |
| .pointerMove(0, 0, {origin: "viewport"}) |
| .pause(50) |
| .send(); |
| await waitForAnimationFrames(2); |
| assert_equals(changeTarget, snapped1, "snapchange has not been called for #snapped2"); |
| assert_equals(changingTarget, snapped2, "snapchanging has been called for #snapped2"); |
| assert_equals(getComputedStyle(target1).getPropertyValue("--snapped"), "", |
| "#target1 not matching scroll-state(snapped) while scrolling"); |
| assert_equals(getComputedStyle(target2).getPropertyValue("--snapped"), "true", |
| "#target2 matching scroll-state(snapped) while scrolling"); |
| }, "scroll-state(snapped) matching #snapped2 while scrolling"); |
| </script> |
