| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" /> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| div { |
| position: absolute; |
| } |
| .scroller-x { |
| overflow: scroll; |
| scroll-snap-type: x mandatory; |
| width: 500px; |
| height: 500px; |
| } |
| .scroller-y { |
| overflow: scroll; |
| scroll-snap-type: y mandatory; |
| width: 500px; |
| height: 500px; |
| } |
| .space { |
| width: 4000px; |
| height: 4000px; |
| } |
| .target { |
| scroll-snap-align: start; |
| height: 400px; |
| width: 400px; |
| } |
| .large-x { |
| width: 3000px; |
| background-color: yellow; |
| } |
| .large-y { |
| height: 2000px; |
| background-color: yellow; |
| } |
| .small { |
| height: 200px; |
| width: 200px; |
| background-color: black; |
| } |
| </style> |
| <div class="scroller-x" id="one-target"> |
| <div class="space"></div> |
| <div class="large-x target" id="single" style="left: 200px;"></div> |
| </div> |
| |
| <div class="scroller-x" id="x"> |
| <div class="space"></div> |
| <div style="left: 200px;"> |
| <div class="target large-x"></div> |
| <div class="target small" style="left: 200px"></div> |
| <div class="target small" style="left: 600px"></div> |
| <div class="target small" style="left: 1200px"></div> |
| </div> |
| </div> |
| |
| <div class="scroller-y" id="y"> |
| <div class="space"></div> |
| <div style="top: 200px;"> |
| <div class="target large-y"></div> |
| <div class="target small" style="top: 200px"></div> |
| <div class="target small" style="top: 600px"></div> |
| <div class="target small" style="top: 1200px"></div> |
| <div class="target large-y" style="top: 2000px"></div> |
| </div> |
| </div> |
| |
| <div class="scroller-x" id="two-axes" style="scroll-snap-type: both mandatory"> |
| <div class="space"></div> |
| <div class="target large-x" style="top: 200px"></div> |
| </div> |
| |
| <div class="scroller-x" id="overlapping-overflow" style="scroll-snap-type: both mandatory"> |
| <div class="space"></div> |
| <div style="left: 200px; top: 200px;"> |
| <div class="target small"></div> |
| <div class="target small"></div> |
| <div class="target small"></div> |
| <div class="target large-y large-x"></div> |
| <div class="target small"></div> |
| <div class="target small"></div> |
| <div class="target small"></div> |
| </div> |
| </div> |
| |
| <script> |
| var one_target_scroller = document.getElementById("one-target"); |
| var scroller_x = document.getElementById("x"); |
| var scroller_y = document.getElementById("y"); |
| var two_axes_scroller = document.getElementById("two-axes"); |
| var overlapping_scroller = document.getElementById("overlapping-overflow"); |
| |
| test(() => { |
| one_target_scroller.scrollTo(10, 0); |
| assert_equals(one_target_scroller.scrollLeft, 200); |
| assert_equals(one_target_scroller.scrollTop, 0); |
| }, "Snaps to the snap position if the snap area doesn't cover the snapport on x."); |
| |
| test(() => { |
| var right_align = 3200 - one_target_scroller.clientWidth; |
| one_target_scroller.scrollTo(right_align, 0); |
| assert_equals(one_target_scroller.scrollLeft, right_align); |
| assert_equals(one_target_scroller.scrollTop, 0); |
| }, "Snaps to the snap position if the snap area covers the snapport on x on the right border."); |
| |
| // We use end alignment for this test so that we don't fall on a snap |
| // position when the snap area just covers the snapport on the left border. |
| test(() => { |
| document.getElementById("single").style.scrollSnapAlign = 'end'; |
| one_target_scroller.scrollTo(200, 0); |
| assert_equals(one_target_scroller.scrollLeft, 200); |
| assert_equals(one_target_scroller.scrollTop, 0); |
| }, "Snaps to the snap position if the snap area covers the snapport on x on the left border."); |
| |
| test(() => { |
| scroller_x.scrollTo(450, 0); |
| assert_equals(scroller_x.scrollLeft, 400); |
| assert_equals(scroller_x.scrollTop, 0); |
| }, "Snaps to a snap area (400) that is closer than the position that reveals " + |
| "the space between snap areas (600) within the larger snap area on x."); |
| |
| test(() => { |
| scroller_y.scrollTo(0, 450); |
| assert_equals(scroller_y.scrollLeft, 0); |
| assert_equals(scroller_y.scrollTop, 400); |
| }, "Snaps to a snap area (400) that is closer than the position that reveals " + |
| "the space between snap areas (600) within the larger snap area on y."); |
| |
| test(() => { |
| scroller_x.scrollTo(1650, 0); |
| assert_equals(scroller_x.scrollLeft, 1650); |
| assert_equals(scroller_x.scrollTop, 0); |
| }, "Snap to current scroll position which is a valid snap position, as the " + |
| "snap area covers snapport on x and there is no intruding snap area."); |
| |
| test(() => { |
| scroller_y.scrollTo(0, 1650); |
| assert_equals(scroller_y.scrollLeft, 0); |
| assert_equals(scroller_y.scrollTop, 1650); |
| }, "Snap to current scroll position which is a valid snap position, as the " + |
| "snap area covers snapport on y and there is no intruding snap area."); |
| |
| test(() => { |
| const maxScrollTop = scroller_y.scrollHeight - scroller_y.clientHeight; |
| |
| // Scroll to the bottom edge which is a valid snap position that a large |
| // target element covers the snapport. |
| scroller_y.scrollTo(0, maxScrollTop); |
| assert_equals(scroller_y.scrollTop, maxScrollTop); |
| |
| // Scroll to `the bottom edge + 1`. |
| scroller_y.scrollTo(0, maxScrollTop + 1); |
| assert_equals(scroller_y.scrollTop, maxScrollTop); |
| }, "Don't snap back even if scrollTo tries to scroll to positions which are " + |
| "outside of the scroll range and if a snap target element covers the snaport"); |
| |
| test(() => { |
| two_axes_scroller.scrollTo(10, 100); |
| assert_equals(two_axes_scroller.scrollLeft, 10); |
| assert_equals(two_axes_scroller.scrollTop, 200); |
| }, "Snap to current scroll position on x as the area is covering x axis." + |
| "However, we snap to the specified snap position on y as the area is not " + |
| "covering y axis."); |
| |
| test(() => { |
| overlapping_scroller.scrollTo(200, 800); |
| assert_equals(overlapping_scroller.scrollLeft, 200); |
| assert_equals(overlapping_scroller.scrollTop, 800); |
| }, "snap to current scroll position on y as the area is covering y axis, " + |
| "even though that area is not the only scroll area at the same position."); |
| |
| test(() => { |
| overlapping_scroller.scrollTo(800, 200); |
| assert_equals(overlapping_scroller.scrollLeft, 800); |
| assert_equals(overlapping_scroller.scrollTop, 200); |
| }, "snap to current scroll position on x as the area is covering x axis, " + |
| "even though that area is not the only scroll area at the same position."); |
| </script> |
