| <!DOCTYPE html> |
| <html> |
| |
| <head> |
| <meta charset="utf-8"> |
| <title> CSS Scroll Snap 2 Test: scroll-start interaction with scroll-snap</title> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-start"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| |
| |
| <body> |
| <style> |
| body { |
| margin: 0px; |
| } |
| |
| .spacer { |
| height: 200px; |
| width: 100px; |
| } |
| |
| .scroller { |
| height: 220px; |
| width: 100px; |
| overflow: scroll; |
| scroll-snap-type: both mandatory; |
| } |
| |
| #single_snap_scroller { |
| scroll-start: 100%; |
| } |
| #multi_snap_scroller { |
| scroll-start: 350px; |
| } |
| |
| .snap_point { |
| width: 100px; |
| height: 200px; |
| scroll-snap-align: start; |
| } |
| </style> |
| <div id="single_snap_scroller" class="scroller"> |
| <div id="top_spacer" class="spacer"></div> |
| <div id="lone_snap_point" class="snap_point"></div> |
| <div id="bottom_spacer" class="spacer"></div> |
| </div> |
| <div id="multi_snap_scroller" class="scroller"> |
| <div id="snap_point_1" class="snap_point"></div> |
| <div id="snap_point_2" class="snap_point"></div> |
| <div id="snap_point_3" class="snap_point"></div> |
| </div> |
| <script> |
| test((t) => { |
| assert_equals(single_snap_scroller.scrollTop, |
| top_spacer.getBoundingClientRect().height, |
| "scroller snaps to top of snap point"); |
| }, "snap overrides scroll-start position"); |
| |
| test((t) => { |
| // scroll-start sets the initial scroll offset to 350px which is closer to |
| // the third snap point than the second, so the scroller should snap to |
| // the third snap_point. |
| assert_equals(multi_snap_scroller.scrollTop, |
| multi_snap_scroller.scrollHeight - multi_snap_scroller.clientHeight, |
| "scroller snaps to snap point closer to start position."); |
| }, "scroller snaps based on scroll-start position"); |
| </script> |
| </body> |
