指定如果足够长得话，应该换行 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    p.test {
      width: 11em;
      border: 1px solid #000000;
      word-wrap: break-word;
    }
  </style>
</head>
<body>

  <p class="test"> This paragraph contains a very long word: thisisaveryveryveryveryveryverylongword. The long word will break and wrap to the next line.</p>

</body>
</html>
        