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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>fetchpriority</title>
</head>
<body>
<script>
onload = function() {
const kData = [
{ src: "../resources/square_25px_x_25px.png?1", fetchPriority: "low" },
{ src: "../resources/square_25px_x_25px.png?2", fetchPriority: "high" },
{ src: "../resources/square_25px_x_25px.png?3", fetchPriority: "auto" },
{ src: "../resources/square_25px_x_25px.png?4"},
];
let numberOfLoads = 0;
for (const data of kData) {
const imgElement = document.createElement("img");
if ("fetchPriority" in data) {
imgElement.fetchPriority = data.fetchPriority;
}
imgElement.addEventListener("load", () => {
++numberOfLoads;
if (numberOfLoads == kData.length) {
opener.postMessage("ChildLoaded");
}
}, { once: "true"});
imgElement.alt = "a";
imgElement.src = data.src;
// Don't append `imgElement` to the document to prevent re-
// priotiziation.
}
}
</script>
</body>
</html>
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