| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title> CSS Scroll Snap 2 Test: scroll-initial-target*</title> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-initial-target"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/dom/events/scrolling/scroll_support.js"></script> |
| </head> |
| <body> |
| <style> |
| #space { |
| width: 1000px; |
| height: 1000px; |
| border: solid 1px red; |
| } |
| #scroller { |
| width: 400px; |
| height: 400px; |
| overflow: hidden; |
| border: solid 1px blue; |
| position: absolute; |
| } |
| #target { |
| width: 100px; |
| height: 100px; |
| background-color: pink; |
| scroll-initial-target: nearest; |
| position: absolute; |
| top: 400px; |
| left: 400px; |
| } |
| </style> |
| <div id="scroller"> |
| <div id="space"></div> |
| <div id="target"></div> |
| </div> |
| <script> |
| promise_test(async (t) => { |
| await waitForCompositorCommit(); |
| |
| assert_equals(scroller.scrollTop, 400, |
| "scroller is vertically scrolled to target"); |
| assert_equals(scroller.scrollLeft, 400, |
| "scroller is horizontally scrolled to target"); |
| |
| target.style.scrollSnapAlign = "center"; |
| await waitForCompositorCommit(); |
| |
| assert_equals(scroller.scrollTop, 250, |
| "scroller is vertically aligned to target's center"); |
| assert_equals(scroller.scrollLeft, 250, |
| "scroller is horizontally aligned to target's center"); |
| |
| target.style.scrollSnapAlign = "end"; |
| await waitForCompositorCommit(); |
| |
| assert_equals(scroller.scrollTop, 100, |
| "scroller is vertically aligned to target's bottom"); |
| assert_equals(scroller.scrollLeft, 100, |
| "scroller is horizontally aligned to target's right"); |
| |
| target.style.scrollSnapAlign = "start"; |
| await waitForCompositorCommit(); |
| |
| assert_equals(scroller.scrollTop, 400, |
| "scroller is vertically aligned to target's top"); |
| assert_equals(scroller.scrollLeft, 400, |
| "scroller is horizontally aligned to target's left"); |
| }, "scroll-initial-target aligns with scroll-snap-align"); |
| </script> |
| </body> |
| </html> |
