1 files changed, 67 insertions, 0 deletions
diff --git a/testing/web-platform/tests/intersection-observer/v2/box-shadow.html b/testing/web-platform/tests/intersection-observer/v2/box-shadow.html
new file mode 100644
index 0000000000..765fa8b2d5
--- /dev/null
+++ b/testing/web-platform/tests/intersection-observer/v2/box-shadow.html
@@ -0,0 +1,67 @@
+<!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;
+}
+#box-shadow {
+  display: inline-block;
+  box-shadow: -50px -50px 0 50px rgba(255, 0, 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=box-shadow></div>
+
+<script>
+var delay = 100;
+var entries = [];
+var target;
+var occluder;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  occluder = document.getElementById("box-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.boxShadow = "none";
+  runTestCycle(step1, 'occluder.style.boxShadow = "none"', delay);
+  assert_equals(entries.length, 1, "Initial notification.");
+  assert_equals(entries[0].isVisible, false, "Initially occluded.");
+}
+
+function step1() {
+  occluder.style.boxShadow = "";
+  runTestCycle(step2, 'occluder.style.boxShadow = ""', delay);
+  assert_equals(entries.length, 2, "Notification after removing box shadow.");
+  assert_equals(entries[1].isVisible, true, "Visible when box shadow removed.");
+}
+
+function step2() {
+  assert_equals(entries.length, 3, "Notification after re-adding box shadow.");
+  assert_equals(entries[2].isVisible, false, "Occluded when box shadow re-added.");
+}
+</script>