| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#scroll-snap-type" /> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| div { |
| position: absolute; |
| margin: 0px; |
| } |
| #scroller { |
| height: 400px; |
| width: 400px; |
| overflow: scroll; |
| } |
| #space { |
| width: 2000px; |
| height: 2000px; |
| } |
| |
| .snap { |
| width: 200px; |
| height: 200px; |
| background-color: blue; |
| scroll-snap-align: start; |
| } |
| #left-top { |
| left: 0px; |
| top: 0px; |
| } |
| #right-bottom { |
| left: 1000px; |
| top: 1000px; |
| } |
| </style> |
| |
| <div id="scroller"> |
| <div id="space"></div> |
| <div class="snap" id="left-top"></div> |
| <div class="snap" id="right-bottom"></div> |
| </div> |
| |
| <script> |
| var scroller = document.getElementById("scroller"); |
| var visible_x = 1000 - scroller.clientWidth; |
| var visible_y = 1000 - scroller.clientHeight; |
| |
| test(() => { |
| scroller.style.scrollSnapType = "both mandatory"; |
| scroller.scrollTo(0, 0); |
| assert_equals(scroller.scrollLeft, 0); |
| assert_equals(scroller.scrollTop, 0); |
| |
| scroller.scrollTo(visible_x + 10, visible_y + 10); |
| assert_equals(scroller.scrollLeft, 1000); |
| assert_equals(scroller.scrollTop, 1000); |
| }, "mandatory scroll-snap-type should snap as long as the element is visible."); |
| |
| test(() => { |
| scroller.style.scrollSnapType = "both proximity"; |
| scroller.scrollTo(0, 0); |
| assert_equals(scroller.scrollLeft, 0); |
| assert_equals(scroller.scrollTop, 0); |
| |
| scroller.scrollTo(visible_x + 10, visible_y + 10); |
| assert_equals(scroller.scrollLeft, visible_x + 10); |
| assert_equals(scroller.scrollTop, visible_y + 10); |
| }, "proximity scroll-snap-type shouldn't snap if the snap position is too far away."); |
| |
| test(() => { |
| scroller.style.scrollSnapType = "both proximity"; |
| scroller.scrollTo(0, 0); |
| assert_equals(scroller.scrollLeft, 0); |
| assert_equals(scroller.scrollTop, 0); |
| |
| scroller.scrollTo(995, 995); |
| assert_equals(scroller.scrollLeft, 1000); |
| assert_equals(scroller.scrollTop, 1000); |
| }, "proximity scroll-snap-type should snap if the snap position is close."); |
| |
| test(_ => { |
| scroller.style.scrollSnapType = "none"; |
| scroller.scrollTo(100, 100); |
| assert_equals(scroller.scrollLeft, 100, "scrolling should not snap"); |
| assert_equals(scroller.scrollTop, 100, "scrolling should not snap"); |
| }, "none scroll-snap-type shouldn't snap."); |
| </script> |
