| <!DOCTYPE html> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <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; |
| } |
| iframe { |
| width: 100px; |
| height: 100px; |
| border: 0; |
| } |
| #text-shadow { |
| display: inline-block; |
| font-size: 144px; |
| font-weight: 1000; |
| color: rgba(0, 0, 0, 0); |
| text-shadow: -100px 0 0 rgba(255, 0, 0, .7); |
| } |
| </style> |
| |
| <iframe id=target srcdoc="<!DOCTYPE html><div>Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum.</div>"></iframe><div id=text-shadow>O</div> |
| |
| <script> |
| var delay = 100; |
| var entries = []; |
| var target; |
| var occluder; |
| |
| runTestCycle(function() { |
| target = document.getElementById("target"); |
| occluder = document.getElementById("text-shadow"); |
| assert_true(!!target, "target exists"); |
| assert_true(!!occluder, "occluder exists"); |
| let 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 observing an iframe element.", delay); |
| |
| function step0() { |
| occluder.style.textShadow = "none"; |
| runTestCycle(step1, 'occluder.style.textShadow = "none"', delay); |
| assert_equals(entries.length, 1, "Initial notification."); |
| assert_equals(entries[0].isVisible, false, "Initially occluded."); |
| } |
| |
| function step1() { |
| occluder.style.textShadow = ""; |
| runTestCycle(step2, 'occluder.style.textShadow = ""', delay); |
| assert_equals(entries.length, 2, "Notification after removing text shadow."); |
| assert_equals(entries[1].isVisible, true, "Visible when text shadow removed."); |
| } |
| |
| function step2() { |
| assert_equals(entries.length, 3, "Notification after re-adding text shadow."); |
| assert_equals(entries[2].isVisible, false, "Occluded when text shadow re-added."); |
| } |
| </script> |
