<!DOCTYPE html>
<head>
<style>
div {
  width: 285px;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  line-height: 1.5em;
  overflow: hidden;
}
</style>
</head>

<body>
  <div>
    ___these_two_lines_should_be_identical___
    ___these_two_lines_should_be_identical___
  </div>
</body>