| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-align"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../support/common.js"></script> |
| <script src="/resources/testdriver.js"></script> |
| <script src="/resources/testdriver-vendor.js"></script> |
| <script src="/resources/testdriver-actions.js"></script> |
| <script src="/dom/events/scrolling/scroll_support.js"></script> |
| <style> |
| .scroller { |
| height: 150px; |
| width: 300px; |
| overflow: auto; |
| position: relative; |
| white-space: nowrap; |
| scroll-snap-type: x mandatory; |
| } |
| .padding { |
| padding: 0 200px; |
| } |
| .child { |
| scroll-snap-align: center; |
| display: inline-block; |
| width: 201px; |
| height: 100%; |
| margin: 0 200px; |
| background-color: blue; |
| } |
| </style> |
| |
| <div class="scroller" id="scroller1"> |
| <div class="padding"> |
| <div class="child"></div> |
| <div class="child"></div> |
| </div> |
| </div> |
| |
| <div class="scroller" id="scroller2"> |
| <div class="padding"> |
| <div class="child"></div> |
| <div class="child"></div> |
| </div> |
| </div> |
| |
| <script> |
| promise_test(async () => { |
| |
| // Scroll to the second child. |
| let scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller2); |
| scroller2.scrollTo(scroller2.scrollWidth, 0); |
| await scrollEndPromise; |
| |
| assert_greater_than(scroller2.scrollLeft, scroller1.scrollLeft); |
| |
| // Scroll back to the first child. |
| scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller2); |
| await keyPress(scroller2, "ArrowLeft"); |
| await scrollEndPromise; |
| |
| // After scrolling to snap to the same child, both scrollers should have the |
| // same scroll position. |
| assert_equals(scroller2.scrollLeft, scroller1.scrollLeft); |
| }, "initial scroll snap matches scrolling scroll snap position."); |
| </script> |
