| <!DOCTYPE html> |
| <html> |
| |
| <head> |
| <meta charset="utf-8"> |
| <title>CSS Test: scroll tracking for ::scroll-markers when scroll containers has large padding </title> |
| <link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-pseudo"> |
| <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="support/scroll-marker-support.js"></script> |
| <script src="/dom/events/scrolling/scroll_support.js"></script> |
| </head> |
| |
| <body> |
| <style> |
| .wrapper { |
| display: grid; |
| justify-content: center; |
| } |
| |
| .carousel { |
| display: grid; |
| grid-auto-flow: column; |
| width: 1600px; |
| height: 512px; |
| overflow-x: scroll; |
| scroll-snap-type: x mandatory; |
| list-style-type: none; |
| scroll-behavior: smooth; |
| border: solid 2px grey; |
| padding-top: 10%; |
| text-align: center; |
| counter-set: markeridx; |
| |
| &>.item { |
| scroll-snap-align: center; |
| height: 80%; |
| width: 318px; |
| border: 1px solid; |
| place-content: center; |
| |
| &::scroll-marker { |
| content: counter(markeridx); |
| counter-increment: markeridx; |
| align-content: center; |
| text-align: center; |
| width: 35px; |
| height: 35px; |
| border: 3px solid gray; |
| border-radius: 50%; |
| margin: 3px; |
| background-color: red; |
| } |
| |
| &::scroll-marker:target-current { |
| background-color: green; |
| } |
| } |
| |
| &>.padding { |
| width: 1600px; |
| height: 90%; |
| border: solid 1px green; |
| } |
| |
| scroll-marker-group: after; |
| |
| &::scroll-marker-group { |
| height: 45px; |
| display: flex; |
| align-items: center; |
| justify-content: center; |
| border: solid 1px black; |
| border-radius: 30px; |
| } |
| } |
| </style> |
| <div class="wrapper"> |
| <div class="carousel" id="carousel"> |
| <div class="padding"></div> |
| <div class="item" tabindex=0>1</div> |
| <div class="item" tabindex=0>2</div> |
| <div class="item" tabindex=0>3</div> |
| <div class="item" tabindex=0>4</div> |
| <div class="item" tabindex=0>5</div> |
| <div class="item" tabindex=0>6</div> |
| <div class="item" tabindex=0>7</div> |
| <div class="item" tabindex=0>8</div> |
| <div class="item" tabindex=0>9</div> |
| <div class="item" tabindex=0>10</div> |
| <div class="item" tabindex=0>11</div> |
| <div class="item" tabindex=0>12</div> |
| <div class="item" tabindex=0>13</div> |
| <div class="item" tabindex=0>14</div> |
| <div class="item" tabindex=0>15</div> |
| <div class="item" tabindex=0>16</div> |
| <div class="padding"></div> |
| </div> |
| </div> |
| <script> |
| const carousel = document.getElementById("carousel"); |
| const items = carousel.querySelectorAll(".item"); |
| |
| RED = "rgb(255, 0, 0)"; |
| GREEN = "rgb(0, 128, 0)"; |
| |
| let current_expected_marker_idx = null; |
| let current_request_id = null; |
| |
| function watchFrames() { |
| current_request_id = requestAnimationFrame(() => { |
| if (current_expected_marker_idx !== null) { |
| verifySelectedMarker(current_expected_marker_idx, items, GREEN, RED); |
| } |
| current_request_id = requestAnimationFrame(watchFrames); |
| }); |
| } |
| |
| // The distribute range[1] is a portion of the scroll range in which we |
| // determine the active scroll-marker in a way that accounts for unreachable |
| // scroll targets[2]. |
| // This tests what happens when we scroll into the distribute range in a |
| // layout scenario where (because of the padding) there is no scroll target |
| // in the distribute range. |
| // [1] https://drafts.csswg.org/css-overflow-5/#:~:text=distribute%20range |
| // [2] https://github.com/w3c/csswg-drafts/issues/11165 |
| async function scroll_test(t, scrollAmount) { |
| await waitForCompositorCommit(); |
| const initial_offset = carousel.scrollLeft; |
| |
| // Watch every frame, verifying the selected marker. |
| watchFrames(); |
| |
| const scrollend_promise = |
| waitForScrollEndFallbackToDelayWithoutScrollEvent(carousel); |
| const actions_promise = new test_driver.Actions().scroll(0, 0, |
| scrollAmount, 0, { origin: carousel }).send(); |
| |
| await Promise.all([actions_promise, scrollend_promise]); |
| |
| assert_equals(carousel.scrollLeft, initial_offset, |
| "carousel is snapped back to initial position."); |
| cancelAnimationFrame(current_request_id); |
| |
| current_expected_marker_idx = null; |
| current_request_id = null; |
| } |
| |
| promise_test(async (t) => { |
| await waitForCompositorCommit(); |
| current_expected_marker_idx = 0; |
| // Scroll left padding into view. |
| const scrollAmount = -carousel.clientWidth; |
| await scroll_test(t, scrollAmount); |
| verifySelectedMarker(0, items, GREEN, RED); |
| }, "scroll-marker selection at left edge with padding"); |
| |
| promise_test(async (t) => { |
| await waitForCompositorCommit(); |
| await waitForScrollReset(t, carousel, carousel.scrollWidth, 0); |
| current_expected_marker_idx = 15; |
| // Scroll right padding into view. |
| const scrollAmount = carousel.clientWidth; |
| await scroll_test(t, scrollAmount); |
| verifySelectedMarker(15, items, GREEN, RED); |
| }, "scroll-marker selection at right edge with padding"); |
| </script> |
| </body> |
| |
| </html> |
