Import Cobalt 21.master.0.253153
diff --git a/src/third_party/web_platform_tests/intersection-observer/iframe-no-root.html b/src/third_party/web_platform_tests/intersection-observer/iframe-no-root.html
new file mode 100644
index 0000000..8532246
--- /dev/null
+++ b/src/third_party/web_platform_tests/intersection-observer/iframe-no-root.html
@@ -0,0 +1,72 @@
+<!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);
+}
+iframe {
+ height: 100px;
+ width: 150px;
+}
+</style>
+
+<div class="spacer"></div>
+<iframe id="target-iframe" src="resources/iframe-no-root-subframe.html"></iframe>
+<div class="spacer"></div>
+
+<script>
+var vw = document.documentElement.clientWidth;
+var vh = document.documentElement.clientHeight;
+
+var iframe = document.getElementById("target-iframe");
+var target;
+var entries = [];
+
+iframe.onload = function() {
+ runTestCycle(function() {
+ assert_true(!!iframe, "iframe exists");
+
+ target = iframe.contentDocument.getElementById("target");
+ assert_true(!!target, "Target element exists.");
+ var 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.");
+ }, "Observer with the implicit root; target in a same-origin iframe.");
+};
+
+function step0() {
+ document.scrollingElement.scrollTop = 200;
+ runTestCycle(step1, "document.scrollingElement.scrollTop = 200");
+ checkLastEntry(entries, 0, [8, 108, 208, 308, 0, 0, 0, 0, 0, vw, 0, vh, false]);
+}
+
+function step1() {
+ iframe.contentDocument.scrollingElement.scrollTop = 250;
+ runTestCycle(step2, "iframe.contentDocument.scrollingElement.scrollTop = 250");
+ assert_equals(entries.length, 1, "entries.length == 1");
+}
+
+function step2() {
+ document.scrollingElement.scrollTop = 100;
+ runTestCycle(step3, "document.scrollingElement.scrollTop = 100");
+ checkLastEntry(entries, 1, [8, 108, -42, 58, 8, 108, 0, 58, 0, vw, 0, vh, true]);
+}
+
+function step3() {
+ checkLastEntry(entries, 2, [8, 108, -42, 58, 0, 0, 0, 0, 0, vw, 0, vh, false]);
+ document.scrollingElement.scrollTop = 0;
+}
+</script>
