I am using Bootstrap 3 and added a tooltip to my div. I've tried using < br > \n and 
 to create the new line. Would it be a problem with the Bootstrap stopping me?
<div class="content show-tooltip" data-placement="top"
data-original-title="1st line of text <br> 2nd line of text">
You need to add data-html="true" to the markup..
<div class="content show-tooltip" data-html="true" data-placement="top"
title="1st line of text <br> 2nd line of text">
Working demo: http://www.bootply.com/83099
In the Title use this code to break the line:
HTML
...title="- Item 1 
 - Item 2 
"
CSS
.ui-tooltip {
/* tooltip container box */
white-space: pre-line;
}
.ui-tooltip-content {
/* tooltip content */
white-space: pre-line;
}
来源:https://stackoverflow.com/questions/19001766/add-line-break-to-tooltip-in-bootstrap-3