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-rw-r--r--testing/web-platform/tests/element-timing/image-rect-iframe.html33
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diff --git a/testing/web-platform/tests/element-timing/image-rect-iframe.html b/testing/web-platform/tests/element-timing/image-rect-iframe.html
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--- /dev/null
+++ b/testing/web-platform/tests/element-timing/image-rect-iframe.html
@@ -0,0 +1,33 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: check intersectionRect for element in iframe</title>
+<body>
+<style>
+body {
+ margin: 50px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+ async_test((t) => {
+ assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
+ on_event(window, 'message', e => {
+ assert_equals(e.data.length, 1);
+ assert_equals(e.data.entryType, 'element');
+ const rect = e.data.rect;
+ // rect should start at (0,0) even though main frame has a margin.
+ assert_equals(rect.left, 0);
+ assert_equals(rect.right, 100);
+ assert_equals(rect.top, 0);
+ assert_equals(rect.bottom, 100);
+ assert_equals(e.data.naturalWidth, 100);
+ assert_equals(e.data.naturalHeight, 100);
+ assert_equals(e.data.id, 'iframe_img_id');
+ assert_equals(e.data.elementId, 'iframe_img_id');
+ t.done();
+ });
+ }, 'Element Timing entry in iframe has coordinates relative to the iframe.');
+</script>
+<iframe src="resources/iframe-with-square-sends-entry.html"/>
+</body>