1 files changed, 36 insertions, 0 deletions
diff --git a/testing/web-platform/tests/paint-timing/fcp-only/fcp-bg-image-set.html b/testing/web-platform/tests/paint-timing/fcp-only/fcp-bg-image-set.html
new file mode 100644
index 0000000000..443cef630b
--- /dev/null
+++ b/testing/web-platform/tests/paint-timing/fcp-only/fcp-bg-image-set.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<head>
+<title>Performance Paint Timing Test: FCP due to background image in image-set</title>
+<style>
+    #main {
+        width: 100px;
+        height: 100px;
+    }
+
+    /* contentful class is defined in test_fcp script. */
+    #main.contentful {
+        background-image: -webkit-image-set(url(../resources/circles.png) 1x);
+        background-image: image-set(url(../resources/circles.png) 1x);
+    }
+</style>
+</head>
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/utils.js"></script>
+<div id="main"></div>
+<script>
+    // Load the image into memory first to make sure it's decoded.
+    function load_image() {
+      const img = document.createElement("img");
+      img.src = "../resources/circles.png";
+
+      return new Promise(resolve => {
+        img.onload = async () => resolve();
+      });
+    }
+
+    test_fcp("First contentful paint fires due to background image in image-set.", load_image);
+</script>
+</body>
+</html>