| <!DOCTYPE html> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../resources/intersection-observer-test-utils.js"></script> |
| |
| <style> |
| body, html { |
| margin: 0; |
| } |
| pre, #log { |
| position: absolute; |
| top: 0; |
| left: 200px; |
| } |
| .testdiv { |
| font-size: 24px; |
| } |
| </style> |
| |
| <div class="testdiv">This is the <span id="target">target</span>.</div> |
| <div class="testdiv" id="occluder">This is the occluder.</div> |
| |
| <script> |
| var delay = 100; |
| var entries = []; |
| var target; |
| var occluder; |
| |
| runTestCycle(function() { |
| target = document.getElementById("target"); |
| occluder = document.getElementById("occluder"); |
| assert_true(!!target, "target exists"); |
| assert_true(!!occluder, "occluder exists"); |
| var observer = new IntersectionObserver(function(changes) { |
| entries = entries.concat(changes) |
| }, {trackVisibility: true, delay: delay}); |
| observer.observe(target); |
| entries = entries.concat(observer.takeRecords()); |
| assert_equals(entries.length, 0, "No initial notifications."); |
| runTestCycle(step0, "First rAF.", delay); |
| }, "IntersectionObserverV2 in a single document using the implicit root, with an occluding element.", delay); |
| |
| function step0() { |
| occluder.style.marginTop = "-10px"; |
| runTestCycle(step1, "occluder.style.marginTop = '-10px'", delay); |
| assert_equals(entries.length, 1); |
| assert_true(entries[0].isVisible); |
| } |
| |
| function step1() { |
| // Occluding elements with opacity=0 should not affect target visibility. |
| occluder.style.opacity = "0"; |
| runTestCycle(step2, "occluder.style.opacity = 0", delay); |
| assert_equals(entries.length, 2); |
| assert_false(entries[1].isVisible); |
| } |
| |
| function step2() { |
| assert_equals(entries.length, 3); |
| assert_true(entries[2].isVisible); |
| } |
| </script> |
