1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/element-timing/observe-background-image.html b/testing/web-platform/tests/element-timing/observe-background-image.html
new file mode 100644
index 0000000000..6a43401cd0
--- /dev/null
+++ b/testing/web-platform/tests/element-timing/observe-background-image.html
@@ -0,0 +1,37 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe element with background image</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+#target {
+  width: 100px;
+  height: 50px;
+  background-image: url('/images/black-rectangle.png');
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+  let beforeRender = performance.now();
+  async_test(function (t) {
+    assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 1);
+        const entry = entryList.getEntries()[0];
+        const pathname = window.location.origin + '/images/black-rectangle.png';
+        checkElement(entry, pathname, 'my_div', 'target', beforeRender,
+            document.getElementById('target'));
+        checkRect(entry, [0, 100, 0, 50]);
+        checkNaturalSize(entry, 100, 50);
+      })
+    );
+    observer.observe({entryTypes: ['element']});
+  }, 'Element with elementtiming attribute and background image is observable.');
+</script>
+<div id='target' elementtiming='my_div'></div>
+</body>