1 files changed, 26 insertions, 0 deletions
diff --git a/testing/web-platform/tests/element-timing/resources/iframe-with-square-sends-entry.html b/testing/web-platform/tests/element-timing/resources/iframe-with-square-sends-entry.html
new file mode 100644
index 0000000000..b8af505d32
--- /dev/null
+++ b/testing/web-platform/tests/element-timing/resources/iframe-with-square-sends-entry.html
@@ -0,0 +1,26 @@
+<!DOCType html>
+<html>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<body>
+<script>
+  const observer = new PerformanceObserver(entryList => {
+    top.postMessage({
+      'length' : entryList.getEntries().length,
+      'entryType' : entryList.getEntries()[0].entryType,
+      'rect' : entryList.getEntries()[0].intersectionRect,
+      'naturalWidth' : entryList.getEntries()[0].naturalWidth,
+      'naturalHeight' : entryList.getEntries()[0].naturalHeight,
+      'id': entryList.getEntries()[0].id,
+      // Elements cannot be cloned, so just send the element ID.
+      'elementId' : entryList.getEntries()[0].element.id,
+    }, '*');
+  });
+  observer.observe({entryTypes: ['element']});
+</script>
+<img src=square100.png id=iframe_img_id elementtiming=my_image/>
+</body>
+</html>