trycss_dim_width_percent 在线代码实例
<img class="normal" src="/upload2/attachments/cover/cover_css.png" width="95" height="84"><br>
<img class="big" src="/upload2/attachments/cover/cover_css.png" width="95" height="84"><br>
<img class="small" src="/upload2/attachments/cover/cover_css.png" width="95" height="84">