<!DOCTYPE html><!-- webkit-test-runner [ additionalSupportedImageTypes=public.heic;public.heics ] -->
<style>
    .green-box {
        width: 100px;
        height: 100px;
        background: url("resources/green-400x400.heic") 200px 200px;
    }
</style>
<body>
    <div class="green-box"></div>
</body>