| <!DOCTYPE html> |
| <title> |
| Snap to a visible area only even when there is a closer snap point for an area |
| that is closer but not visible (using y-axis snap type) |
| </title> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#snap-scope"/> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| div { |
| position: absolute; |
| margin: 0px; |
| } |
| |
| #scroller { |
| height: 600px; |
| width: 600px; |
| overflow: scroll; |
| scroll-snap-type: y mandatory; |
| } |
| |
| #space { |
| width: 2000px; |
| height: 2000px; |
| } |
| |
| .snap { |
| width: 200px; |
| height: 200px; |
| background-color: blue; |
| scroll-snap-align: start; |
| } |
| |
| #top-visible { |
| left: 0px; |
| top: 0px; |
| } |
| |
| #bottom-visible { |
| left: 0px; |
| top: 800px; |
| } |
| |
| #middle-not-visible { |
| left: 800px; |
| top: 700px; |
| } |
| |
| </style> |
| <div id="scroller"> |
| <div id="space"></div> |
| <div id="top-visible" class="snap"></div> |
| <div id="middle-not-visible" class="snap"></div> |
| <div id="bottom-visible" class="snap"></div> |
| </div> |
| <script> |
| test(() => { |
| const scroller = document.getElementById("scroller"); |
| scroller.scrollTo(0, 0); |
| assert_equals(scroller.scrollLeft, 0); |
| assert_equals(scroller.scrollTop, 0); |
| scroller.scrollTo(0, 500); |
| assert_equals(scroller.scrollLeft, 0); |
| assert_equals(scroller.scrollTop, 800); |
| }, 'Only snap to visible area on Y axis, even when the non-visible ones are closer'); |
| </script> |
