<!DOCTYPE html>
<style>
a {
    font-size: 20px;
    text-decoration: none;
    color: green;
}

div {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 1;
    width: 200px;
}
</style><div><a href="" id=clamp>pass if this text content is visible</a></div>
<div style="position: relative; top: -20px; left: 179px; width: 100px; height: 100px; background-color: white;"></div><script>
if (window.testRunner)
    testRunner.waitUntilDone();
setTimeout(function() {
    clamp.style.color = "green";
    if (window.testRunner)
        testRunner.notifyDone();
}, 0);
</script>