<div id="target" style="
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden;
    -webkit-line-clamp: 2;
    width: 100px;
">
    <div>
        Unless this sentence is truncated after two lines, PASS.
    </div>
</div>
<script>
    document.body.offsetTop;
    target.style.removeProperty("-webkit-line-clamp");
</script>