1 files changed, 49 insertions, 0 deletions
diff --git a/testing/web-platform/tests/intersection-observer/cross-document-root.html b/testing/web-platform/tests/intersection-observer/cross-document-root.html
new file mode 100644
index 0000000000..9288bf5806
--- /dev/null
+++ b/testing/web-platform/tests/intersection-observer/cross-document-root.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<meta name="viewport" content="width=device-width,initial-scale=1">
+<link rel="author" href="mailto:szager@chromium.org" title="Stefan Zager">
+<link rel="help" href="https://w3c.github.io/IntersectionObserver/#update-intersection-observations-algo">
+
+<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;
+}
+iframe {
+  height: 250px;
+  width: 150px;
+  border: 0;
+}
+</style>
+<iframe id="target-iframe" src="resources/iframe-no-root-subframe.html"></iframe>
+
+<script>
+var iframe = document.getElementById("target-iframe");
+var target;
+var root;
+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)
+    }, { root: document });
+    observer.observe(target);
+    entries = entries.concat(observer.takeRecords());
+    assert_equals(entries.length, 0, "No initial notifications.");
+    runTestCycle(step0, "First rAF.");
+  }, "Observer with explicit root which is the document, observing a target in a same-origin iframe.");
+};
+
+function step0() {
+  checkLastEntry(entries, 0, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, false]);
+}
+</script>