| <!DOCTYPE html> |
| <title> |
| Updating the scroll-snap-type of a snap container should make it resnap accordingly. |
| </title> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#re-snap" /> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| div { |
| position: absolute; |
| margin: 0; |
| } |
| |
| #scroller { |
| height: 500px; |
| width: 500px; |
| overflow: hidden; |
| scroll-snap-type: none; |
| } |
| |
| #y-target { |
| width: 300px; |
| height: 300px; |
| top: 100px; |
| left: 0; |
| background-color: green; |
| scroll-snap-align: start none; |
| } |
| |
| #x-target { |
| width: 300px; |
| height: 300px; |
| top: 0; |
| left: 100px; |
| background-color: red; |
| scroll-snap-align: none start; |
| } |
| |
| .area { |
| width: 2000px; |
| height: 2000px; |
| } |
| </style> |
| |
| <div id="scroller"> |
| <div class="area"></div> |
| <div id="x-target"></div> |
| <div id="y-target"></div> |
| </div> |
| |
| <script> |
| const x_target = document.getElementById("x_target"); |
| const y_target = document.getElementById("y_target"); |
| const scroller = document.getElementById("scroller"); |
| |
| function cleanup() { |
| scroller.style.setProperty("scroll-snap-type", "none"); |
| } |
| |
| test(t => { |
| t.add_cleanup(cleanup); |
| scroller.scrollTo(0,0); |
| assert_equals(scroller.scrollTop, 0); |
| assert_equals(scroller.scrollLeft, 0); |
| |
| scroller.style.setProperty("scroll-snap-type", "y mandatory"); |
| assert_equals(scroller.scrollTop, 100); |
| assert_equals(scroller.scrollLeft, 0); |
| }, "Changing the scroller's snap type to y should make it resnap on the y-axis."); |
| |
| test(t => { |
| t.add_cleanup(cleanup); |
| scroller.scrollTo(0,0); |
| assert_equals(scroller.scrollTop, 0); |
| assert_equals(scroller.scrollLeft, 0); |
| |
| scroller.style.setProperty("scroll-snap-type", "x mandatory"); |
| assert_equals(scroller.scrollLeft, 100); |
| assert_equals(scroller.scrollTop, 0); |
| }, "Changing the scroller's snap type to x should make it resnap on the x-axis."); |
| |
| |
| test(t => { |
| t.add_cleanup(cleanup); |
| scroller.scrollTo(0,0); |
| assert_equals(scroller.scrollTop, 0); |
| assert_equals(scroller.scrollLeft, 0); |
| |
| scroller.style.setProperty("scroll-snap-type", "x mandatory"); |
| assert_equals(scroller.scrollLeft, 100); |
| assert_equals(scroller.scrollTop, 0); |
| |
| scroller.style.setProperty("scroll-snap-type", "y mandatory"); |
| assert_equals(scroller.scrollTop, 100); |
| }, "Changing the scroller's snap type axis should make it resnap."); |
| </script> |
