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Test Info:

<!DOCTYPE html>
<title>Performance Paint Timing Test: FCP due to background image in image-set</title>
#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);
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/utils.js"></script>
<div id="main"></div>
// 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);