File: load-image.html

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<!DOCTYPE html>
<html>
<body>
<script>
function canLoadImage(url) {
    return new Promise(resolve => {
        let element = document.createElement("img");
        let complete = event => {
            element.remove();
            resolve(event.type !== "error");
        };
        element.addEventListener("load", complete);
        element.addEventListener("error", complete);
        element.setAttribute("src", url);
        document.body.appendChild(element);
    });
};
</script>
</body>
</html>