在CSS中，我們可以通過下面的樣式實現DIV元素中文本超長后自動截斷並以省略號結尾：
overflow: hidden;
word-break: normal;
text-overflow: ellipsis;
text-overflow: ellipsis是實現文本截斷后以省略號結尾的關鍵樣式，但問題是如果添加該樣式則DIV元素內的文本無法自動換行，也就是說該效果只被允許在單行文本上實現。另外，word-break: normal可以防止文字被部分截斷，這個在內容為英文的情況下顯得尤其重要。
要實現多行文本自動截斷以省略號結尾的效果，通常的做法是使用JavaScript腳本。下面這些文章給出了如何通過腳本進行字符串截斷，不過僅限於英文環境。
http://www.barelyfitz.com/projects/truncate/
http://www.javascriptsource.com/miscellaneous/truncate-text.html
http://www.javascriptbank.com/truncate-html-text.html/en/
使用純CSS樣式來實現該效果則會稍微有些麻煩，你需要懂得如何在CSS中進行hack。這里是一個可以在多個通用瀏覽器中實現該效果的例子:
<!DOCTYPE HTML> <html> <head> <style> html, body, p { margin: 0; padding: 0; font-family: sans-serif;} .ellipsis { overflow: hidden; height: 200px; line-height: 25px; margin: 20px; border: 5px solid #AAA; } .ellipsis:before { content:""; float: left; width: 5px; height: 200px; } .ellipsis > *:first-child { float: right; width: 100%; margin-left: -5px; } .ellipsis:after { content: "\02026"; box-sizing: content-box; -webkit-box-sizing: content-box; -moz-box-sizing: content-box; float: right; position: relative; top: -25px; left: 100%; width: 3em; margin-left: -3em; padding-right: 5px; text-align: right; background: -webkit-gradient(linear, left top, right top, from(rgba(255, 255, 255, 0)), to(white), color-stop(50%, white)); background: -moz-linear-gradient(to right, rgba(255, 255, 255, 0), white 50%, white); background: -o-linear-gradient(to right, rgba(255, 255, 255, 0), white 50%, white); background: -ms-linear-gradient(to right, rgba(255, 255, 255, 0), white 50%, white); background: linear-gradient(to right, rgba(255, 255, 255, 0), white 50%, white); } </style> </head> <body> <div class="ellipsis"><div> <p>Call me Ishmael. Some years ago – never mind how long precisely – having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world. It is a way I have of driving off the spleen, and regulating the circulation. Whenever I find myself growing grim about the mouth; whenever it is a damp, drizzly November in my soul; whenever I find myself involuntarily pausing before coffin warehouses, and bringing up the rear of every funeral I meet; and especially whenever my hypos get such an upper hand of me, that it requires a strong moral principle to prevent me from deliberately stepping into the street, and methodically knocking people's hats off – then, I account it high time to get to sea as soon as I can.</p> </div></div> </body> </html>
通過修改.ellipsis和.ellipsis:before樣式中height屬性的值來指定容器的高度。該樣式的實現在多個不同版本的瀏覽器下測試通過，注意如果你是在IE下查看則需要確保你的文檔模型必須是在標准模式下，即Document Mode必須是Standards。
這里是原文出處：CSS Ellipsis: How to Manage Multi-Lice Ellipsis in Pure CSS