Object-fit

.container {
    width: 500px;
    height: 250px;
}
.container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

<div class="container">
    <img src="xxxxx.jpg" data-object-fit="cover">
</div>

<script src="js/objectFitPolyfill.min.js"></script>