ladybird/Tests/LibWeb/Text/input/input-image.html

<script src="./include.js"></script>
<script type="text/javascript">
    const SOURCES = ["../../Layout/input/120.png", "file:///i-do-no-exist-i-swear.png"];

    const runTest = source => {
        let input = document.createElement("input");
        input.type = "image";
        input.alt = "submit";

        return new Promise((resolve, reject) => {
            input.addEventListener("load", () => {
                const filename = input.src.split('/').pop();
                resolve(`${filename} loaded`);
            });
            input.addEventListener("error", () => {
                resolve(`${input.src} failed`);
            });

            input.setAttribute("src", source);
        });
    };

    asyncTest(done => {
        let promises = SOURCES.map(source => runTest(source));

        Promise.allSettled(promises)
            .then(results => results.map(result => result.value))
            .then(results => results.sort())
            .then(results => results.forEach(println))
            .finally(done);
    });
</script>