There are times where you need to reset a an element’s styles. Instead of overwriting it with even more style declarations, you can simply reset them.
/* Styles go here */ body { color: #d200ff; } button { color: white; font-size: 14px; background: lightgreen; text-align: center; border: none; padding: 10px 20px; } section { font-size: 16px; } section button { color: unset; /*since section doesn‘t have color set, will use body color*/ font-size: unset; /*use section font-size*/ }
[CSS] Easily Reset Styles With a Single CSS value
原文：http://www.cnblogs.com/Answer1215/p/6148010.html