| <!DOCTYPE html> |
| <html> |
| |
| <head> |
| <meta charset="utf-8"> |
| <title> CSS Scroll Snap 2 Test: scroll-initial-target*</title> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-initial-target"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/resources/testdriver.js"></script> |
| <script src="/resources/testdriver-actions.js"></script> |
| <script src="/resources/testdriver-vendor.js"></script> |
| <script src="/dom/events/scrolling/scroll_support.js"></script> |
| </head> |
| |
| <body> |
| <style> |
| .spacer { |
| width: 1000px; |
| height: 1000px; |
| } |
| |
| .scroller { |
| width: 300px; |
| height: 300px; |
| border: solid 1px black; |
| overflow: scroll; |
| margin: 0px; |
| position: absolute; |
| } |
| |
| .box { |
| position: absolute; |
| width: 200px; |
| height: 200px; |
| } |
| |
| .top_left { |
| top: 0px; |
| left: 0px; |
| background-color: red; |
| } |
| |
| .center { |
| top: 200px; |
| left: 200px; |
| background-color: purple; |
| scroll-initial-target: nearest; |
| } |
| |
| .bottom_right { |
| top: 400px; |
| left: 400px; |
| background-color: yellow; |
| } |
| </style> |
| <div class="scroller" id="user_scroller"> |
| <div class="spacer"></div> |
| <div class="top_left box" id="user_top_left_box"></div> |
| <div class="center box"></div> |
| <div class="bottom_right box"></div> |
| </div> |
| <div class="scroller" id="programmatic_scroller" style="left: 500px"> |
| <div class="spacer"></div> |
| <div class="top_left box" id="programmatic_top_left_box"></div> |
| <div class="center box"></div> |
| <div class="bottom_right box"></div> |
| </div> |
| <script> |
| async function user_scroll(scroller, current_offset, target_offset) { |
| return new test_driver.Actions().scroll(0, 0, |
| target_offset.x - current_offset.x, |
| target_offset.y - current_offset.y, { origin: scroller }) |
| .send(); |
| } |
| |
| function programmatic_scroll(scroller, current_offset, target_offset) { |
| scroller.scrollTo(target_offset.x, target_offset.y); |
| } |
| |
| async function test_scroll_initial_target(test, scroller, msg, scrolling_function) { |
| await waitForCompositorCommit(); |
| let top_left_box = document.getElementById("user_top_left_box"); |
| |
| let expected_scroll_top = top_left_box.getBoundingClientRect().height; |
| let expected_scroll_left = top_left_box.getBoundingClientRect().width; |
| |
| assert_approx_equals(scroller.scrollTop, expected_scroll_top, 1, |
| "scroll-initial-target sets initial vertical scroll position"); |
| assert_approx_equals(scroller.scrollLeft, expected_scroll_left, 1, |
| "scroll-initial-target sets initial horizontal scroll position"); |
| |
| let scrollend_promise = new Promise((resolve) => { |
| scroller.addEventListener("scrollend", resolve); |
| }); |
| const current_offset = { x: scroller.scrollLeft, y: scroller.scrollTop }; |
| const target_offset = { |
| x: current_offset.x + 100, |
| y: current_offset.y + 100 |
| }; |
| await scrolling_function(scroller, current_offset, target_offset); |
| |
| // Only wait for scrollend if it is supported. |
| if (window.onscrollend == null || window.onscrollend != undefined) { |
| await scrollend_promise; |
| } |
| assert_approx_equals(scroller.scrollTop, target_offset.y, 1, |
| `${msg} (vertical)`); |
| assert_approx_equals(scroller.scrollLeft, target_offset.x, 1, |
| `${msg} (horizontal)`); |
| } |
| |
| promise_test(async (t) => { |
| let scroller = document.getElementById("user_scroller"); |
| const msg = "user scroll is not overriden in by scroll-initial-target"; |
| await test_scroll_initial_target(t, scroller, msg, user_scroll); |
| }, "scroll-initial-target does not override user scroll"); |
| |
| promise_test(async (t) => { |
| let scroller = document.getElementById("programmatic_scroller"); |
| const msg = |
| "programmatic scroll is not overriden in by scroll-initial-target"; |
| await test_scroll_initial_target(t, scroller, msg, programmatic_scroll); |
| }, "scroll-initial-target does not override programmatic scroll"); |
| </script> |
| </body> |
