Import Cobalt 21.master.0.253153
diff --git a/src/third_party/web_platform_tests/intersection-observer/disconnect.html b/src/third_party/web_platform_tests/intersection-observer/disconnect.html
new file mode 100644
index 0000000..9c02daf
--- /dev/null
+++ b/src/third_party/web_platform_tests/intersection-observer/disconnect.html
@@ -0,0 +1,54 @@
+<!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>
+pre, #log {
+ position: absolute;
+ top: 0;
+ left: 200px;
+}
+.spacer {
+ height: calc(100vh + 100px);
+}
+#target {
+ width: 100px;
+ height: 100px;
+ background-color: green;
+}
+</style>
+
+<div class="spacer"></div>
+<div id="target"></div>
+<div class="spacer"></div>
+
+<script>
+var entries = [];
+var observer;
+var target;
+
+runTestCycle(function() {
+ target = document.getElementById("target");
+ assert_true(!!target, "target exists");
+ observer = new IntersectionObserver(function(changes) {
+ entries = entries.concat(changes)
+ });
+ observer.observe(target);
+ entries = entries.concat(observer.takeRecords());
+ assert_equals(entries.length, 0, "No initial notifications.");
+ runTestCycle(step0, "First rAF.");
+}, "IntersectionObserver should not deliver pending notifications after disconnect().");
+
+function step0() {
+ runTestCycle(step1, "observer.disconnect()");
+ document.scrollingElement.scrollTop = 300;
+ observer.disconnect();
+ assert_equals(entries.length, 1, "Initial notification.");
+}
+
+function step1() {
+ assert_equals(entries.length, 1, "No new notifications.");
+}
+</script>
