| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1" /> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script src="../../resources/gesture-util.js"></script> |
| <style> |
| div { |
| position: absolute; |
| } |
| #scroller { |
| position: relative; |
| margin-left: auto; |
| writing-mode: vertical-rl; |
| width: 400px; |
| height: 400px; |
| overflow: scroll; |
| scroll-snap-type: both mandatory; |
| padding: 0px; |
| } |
| .snap { |
| width: 200px; |
| height: 200px; |
| background-color: blue; |
| scroll-snap-align: start; |
| } |
| #space { |
| width: 1000px; |
| height: 1000px; |
| } |
| .left { |
| left: -400px; |
| top: 0px; |
| } |
| .right { |
| left: 0px; |
| top: 0px; |
| } |
| </style> |
| |
| <div id='scroller'> |
| <div id="space"></div> |
| <div class="snap left" id="left"></div> |
| <div class="snap right" id="right"></div> |
| </div> |
| |
| <script> |
| var scroller = document.getElementById("scroller"); |
| var width = scroller.clientWidth; |
| |
| promise_test (async () => { |
| // Ensure focus. |
| await mouseClickOn(510, 10); |
| // Snap to #left and then use a RightArrow keyPress to snap to #right. |
| // 585 represents the scroll amount needed to align the scroller's right edge |
| // with #left's right edge: |
| // | left.offsetLeft + (left.offsetWidth - scroller.clientWidth) | |
| await waitForScrollReset(scroller, -585, 0); |
| await keyboardScroll("ArrowRight", scroller); |
| // The left border of #right is at -width. |
| // The right border of #right is thus 200 - width. |
| // When right-aligned, the scroll position should be 200 - width. |
| assert_equals(scroller.scrollLeft, 200 - width); |
| }, "Snaps to #right after pressing ArrowRight"); |
| |
| promise_test (async () => { |
| // Ensure focus. |
| await mouseClickOn(510, 10); |
| // Snap to #right and then use a LeftArrow keyPress to snap to #left. |
| // 185 represents the scroll amount needed to align the scroller's right edge |
| // with #right's right edge: |
| // | right.offsetLeft + (right.offsetWidth - scroller.clientWidth)| |
| await waitForScrollReset(scroller, -185, 0); |
| await keyboardScroll("ArrowLeft", scroller); |
| // The left border of #left is at -(400 + width). |
| // The right border of #left is thus -(200 + width). |
| // When right-aligned, the scroll position should be -(200 + width). |
| assert_equals(scroller.scrollLeft, -(200 + width)); |
| }, "Snaps to #left after pressing ArrowLeft"); |
| </script> |
