| <!doctype HTML> |
| <html> |
| <meta charset="utf8"> |
| <title>CSS Content Visibility: auto + overflow clip + scrollIntoView, ContentVisibilityAutoStateChange fires trece</title> |
| <link rel="author" title="Cathie Chen" href="mailto:[email protected]"> |
| <link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility"> |
| <meta name="assert" |
| content="If content-visibility: auto element is not relevent to user after calling scrollIntoView of its descendant, contentvisibilityautostatechange trece"> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/common/rendering-utils.js"></script> |
| |
| <style> |
| .auto { |
| content-visibility: auto; |
| contain-intrinsic-size: auto 1px auto 10000px; |
| } |
| |
| .child { |
| height: 40000px; |
| position: relative; |
| } |
| |
| #target { |
| position: absolute; |
| bottom: 0; |
| } |
| |
| .before_target { |
| height: 40000px; |
| } |
| |
| #overflow_clip { |
| overflow: clip; |
| height: 20000px; |
| } |
| </style> |
| |
| <div id=e1 class="auto before_target"></div> |
| <div id=e2 class="auto before_target"></div> |
| <div id=e3 class="auto"> |
| <div id="overflow_clip"> |
| <div class=child> |
| <div id=target>PASS</div> |
| </div> |
| </div> |
| </div> |
| <div id=e4 class=auto> |
| <div class=child></div> |
| </div> |
| |
| <script> |
| function waitForEvent() { |
| return new Promise(resolve => e3.addEventListener('contentvisibilityautostatechange', resolve, { once: true })); |
| } |
| |
| promise_test(async (t) => { |
| var eventCounter = 0; |
| function eventHandler(e) { |
| eventCounter++; |
| if (eventCounter == 1) { |
| assert_equals(e.skipped, true, "the first event is the initial one"); |
| } else if (eventCounter == 2) { |
| assert_equals(e.skipped, false, "the second event should be generated by visible"); |
| } else if (eventCounter == 3) { |
| assert_equals(e.skipped, true, "the third event should be generated by hidden"); |
| } |
| } |
| |
| e3.addEventListener("contentvisibilityautostatechange", eventHandler); |
| // Make sure the first event has fired. |
| await waitForEvent(); |
| target.scrollIntoView(); |
| await waitForEvent(); |
| await waitForEvent(); |
| await waitForAtLeastOneFrame(); |
| assert_equals(eventCounter, 3, "There should be three contentvisibilityautostatechange events."); |
| }, "ContentVisibilityAutoStateChange fires trece when `scrollIntoView` a descendant of `content-visibility:auto` which is hidden after scrolling"); |
| </script> |
