Import Cobalt 21.master.0.253153
diff --git a/src/third_party/web_platform_tests/intersection-observer/v2/inline-occlusion.html b/src/third_party/web_platform_tests/intersection-observer/v2/inline-occlusion.html
new file mode 100644
index 0000000..e4b097e
--- /dev/null
+++ b/src/third_party/web_platform_tests/intersection-observer/v2/inline-occlusion.html
@@ -0,0 +1,62 @@
+<!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>
