| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" /> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| div { |
| position: absolute; |
| } |
| #scroller { |
| overflow: hidden; /* TODO: Use scrollbar-width: none */ |
| scroll-snap-type: x mandatory; |
| width: 500px; |
| height: 500px; |
| } |
| .space { |
| width: 2000px; |
| height: 2000px; |
| } |
| #target { |
| height: 200px; |
| width: 200px; |
| left: 50px; |
| background-color: blue; |
| } |
| </style> |
| <div id="scroller"> |
| <div class="space"></div> |
| <div id="target"></div> |
| </div> |
| <script> |
| test(() => { |
| target.style.scrollSnapAlign = "start"; |
| target.style.transform = "translateX(300px)"; |
| scroller.scrollTo(10, 0); |
| assert_equals(scroller.scrollLeft, 350 /* left + translateX(300px) */); |
| assert_equals(scroller.scrollTop, 0); |
| }, "Snaps to the transformed snap start position"); |
| |
| test(() => { |
| target.style.scrollSnapAlign = "end"; |
| target.style.transform = "translateX(300px)"; |
| scroller.scrollTo(10, 0); |
| assert_equals(scroller.scrollLeft, |
| 50 /* left + width + translateX(300px) - scroller.width */); |
| assert_equals(scroller.scrollTop, 0); |
| }, "Snaps to the transformed snap end position"); |
| |
| test(() => { |
| target.style.scrollSnapAlign = "start"; |
| target.style.transform = "translateX(-100px)"; |
| scroller.scrollTo(10, 0); |
| assert_equals(scroller.scrollLeft, 0); |
| assert_equals(scroller.scrollTop, 0); |
| }, "Snaps to visible top left position of the transformed box"); |
| |
| </script> |
