| <!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> |
| </head> |
| <body> |
| <style> |
| #space-filler { |
| width: 500px; |
| height: 500px; |
| border: solid 1px red; |
| } |
| #outer-container { |
| width: 400px; |
| height: 400px; |
| overflow: scroll; |
| border: solid 2px blue; |
| } |
| #inner-container { |
| top: 20px; |
| left: 20px; |
| width: 300px; |
| height: 300px; |
| overflow: scroll; |
| position: relative; |
| border: solid 2px black; |
| } |
| #target { |
| width: 100px; |
| height: 100px; |
| background-color: pink; |
| scroll-initial-target: nearest; |
| } |
| </style> |
| <div id="outer-container"> |
| <div id="inner-container"> |
| <div id="space-filler"></div> |
| <div id="target"> |
| </div> |
| </div> |
| </div> |
| <script> |
| let outer_scroller = document.getElementById("outer-container"); |
| let inner_scroller = document.getElementById("inner-container"); |
| let space_filler = document.getElementById("space-filler"); |
| let target = document.getElementById("target"); |
| |
| const target_height = target.getBoundingClientRect().height; |
| const space_filler_height = space_filler.getBoundingClientRect().height; |
| const total_content_height = target_height + space_filler_height; |
| |
| async function resetDisplay() { |
| return new Promise((resolve) => { |
| if (getComputedStyle(outer_scroller).display == "block" && |
| getComputedStyle(inner_scroller).display == "block" && |
| getComputedStyle(target).display == "block") { |
| resolve(); |
| } else { |
| outer_scroller.style.display = "block"; |
| inner_scroller.style.display = "block"; |
| target.style.display = "block"; |
| requestAnimationFrame(async () => { |
| await resetDisplay(); |
| resolve(); |
| }); |
| } |
| }); |
| } |
| |
| async function waitForDisplay(element, display) { |
| return new Promise((resolve) => { |
| if (getComputedStyle(element).display == display) { |
| resolve(); |
| } else { |
| requestAnimationFrame(async () => { |
| await waitForDisplay(element, display); |
| resolve(); |
| }) |
| } |
| }); |
| } |
| |
| promise_test(async (t) => { |
| await resetDisplay(); |
| let initial_expected_scroll_top = |
| total_content_height - inner_scroller.clientHeight; |
| assert_equals(inner_scroller.scrollTop, initial_expected_scroll_top, |
| "inner-scroller is scrolled to scroll-initial-target"); |
| |
| let display_promise = waitForDisplay(target, "none"); |
| target.style.display = "none"; |
| await display_promise; |
| |
| let final_expected_scroll_top = initial_expected_scroll_top - target_height; |
| assert_equals(inner_scroller.scrollTop, final_expected_scroll_top, |
| "inner scroller is clamped to updated scroll range"); |
| }, "display:block scroll-initial-target becomes display: none"); |
| |
| promise_test(async (t) => { |
| await resetDisplay(); |
| let initial_expected_scroll_top = |
| total_content_height - inner_scroller.clientHeight; |
| assert_equals(inner_scroller.scrollTop, initial_expected_scroll_top, |
| "inner-scroller is scrolled to scroll-initial-target"); |
| |
| let display_promise = waitForDisplay(target, "none"); |
| target.style.display = "none"; |
| await display_promise; |
| assert_equals(inner_scroller.scrollTop, |
| initial_expected_scroll_top - target_height, |
| "inner scroller is clamped to updated scroll range"); |
| |
| display_promise = waitForDisplay(target, "block"); |
| target.style.display = "block"; |
| await display_promise; |
| assert_equals(inner_scroller.scrollTop, initial_expected_scroll_top, |
| "inner scroller is updated as scroll-initial-target reappears"); |
| }, "display:none scroll-initial-target becomes display: block"); |
| </script> |
| </body> |
| </html> |
