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<!DOCTYPE html>
<head>
<title>Performance Paint Timing Test: FCP should fire for background image only when visible</title>
<style>
#main {
width: 100px;
height: 100px;
}
/* contentful and preFCP classes are defined in test_fcp script. */
#main.preFCP {
visibility: hidden;
}
#main.contentful, #main.preFCP {
background-image: url(../resources/circles.png);
}
#main.contentful {
visibility: visible;
}
</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 for background image only when visible.", load_image);
</script>
</body>
</html>
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