user-modify属性。

user-modify属性，用来控制用户能否对页面文本进行编辑。与标签的contentEditable属性类似。·

-webkit-user-modify: read-only | read-write | read-write-plaintext-only

CSS代码：

 1 .test {
 2     height: 100px;
 3     padding: 5px;
 4     border: 1px solid #a0b3d6;
 5     overflow: auto;
 6 }
 7 .test:focus {
 8     box-shadow: 0 0 5px blue;
 9 }
10 .read-only {
11     -webkit-user-modify: read-only;
12 }
13 .read-write {
14     -webkit-user-modify: read-write;;
15 }
16 .write-only {
17     /* 几乎没有浏览器支持 */
18     user-modify: write-only;
19 }
20 .read-write-plaintext-only {
21     -webkit-user-modify: read-write-plaintext-only;
22 }

HTML代码：

1 <strong>read-only</strong>
2 <p class="test read-only"></p>
3 <strong>write-only</strong>
4 <p class="test write-only"></p>
5 <strong>read-write</strong>
6 <p class="test read-write"></p>
7 <strong>read-write-plaintext-only</strong>
8 <p class="test read-write-plaintext-only"></p>