问题
I'm trying to create a text editor using jQuery and execCommand. Everything was going good until I noticed that both superscript and subscript aren't properly toggling.
This jsFiddle (http://jsfiddle.net/k8F4P/) should illustrate the problem.
It is possible that it is simply my browser, but I'm using the latest version of Chrome for Mac.
回答1:
Turned out the issue was that the stylesheet normalize.css was setting the sub and sup tags' vertical-align to baseline and this was preventing the correct toggling, but only in Chrome. The simple solution is to set sub to vertical-align: sub and sup to vertical-align: super.
来源：https://stackoverflow.com/questions/17517839/jquery-execcommand-for-superscript-and-subscript-not-properly-toggling