| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#scroll-snap-type" /> |
| <meta name="viewport" content="user-scalable=no"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| div, html, body { |
| margin: 0; |
| padding: 0; |
| } |
| html { |
| margin: 0px; |
| overflow: scroll; |
| } |
| #scroller { |
| margin-left: 200px; |
| |
| height: 300px; |
| width: 300px; |
| overflow: scroll; |
| } |
| .space { |
| width: 2000px; |
| height: 2000px; |
| } |
| .snap_area { |
| margin-left: 200px; |
| top: 0; |
| width: 200px; |
| height: 200px; |
| background-color: blue; |
| scroll-snap-align: none start; |
| } |
| </style> |
| |
| <!-- Add snap area to the root scroller --> |
| <div class="snap_area" id="viewport"></div> |
| |
| <div id="scroller"> |
| <div class="snap_area" id="inner"></div> |
| <div class="space"></div> |
| </div> |
| |
| <div class="space"></div> |
| |
| <script> |
| |
| const scrollers = [document.scrollingElement, document.getElementById("scroller")]; |
| for (const scroller of scrollers) { |
| test(_ => { |
| scroller.style.scrollSnapType = 'x mandatory'; |
| scroller.scrollTo(100, 0); |
| assert_equals(scroller.scrollLeft, 200, "scrolling should snap"); |
| |
| // When snap type is 'none' the scroller, scrolling should not snap. |
| scroller.style.scrollSnapType = 'none'; |
| scroller.scrollTo(100, 0); |
| assert_equals(scroller.scrollLeft, 100, "scrolling should not snap"); |
| |
| // When snap type is changed back to mandatory, scrolling should snap. |
| scroller.style.scrollSnapType = 'x mandatory'; |
| scroller.scrollTo(110, 0); |
| assert_equals(scroller.scrollLeft, 200, "scrolling should snap after change"); |
| }, `scroll-snap-type on ${scroller.nodeName} should control snapping behavior and changing it takes effect`); |
| } |
| </script> |