是否有可能以某种方式测量具有多个中断/返回的段落中最后一行文本的长度？
Morbi leo risus, porta ac consectetur ac, vestibulum at eros.
Donec id elit non mi porta gravida at eget metus. Nulla vitae
elit libero, a pharetra augue. Nullam id dolor id nibh
ultricies vehicula ut id elit. Vivamus sagittis lacus vel
[here] ->|augue laoreet rutrum faucibus dolor auctor.|<- [to here]
注意:文本中没有手动中断.它是一个包含在内部的单行文本,比方说,一个<p></p>标记.