1.Properties for spacing-out elements
外边距：A margin is the space space outside something
内边距：padding is the space inside something
2.margin-top margin-right margin-bottom margin-left
padding-top padding-right padding-bottom padding-left
3.Margins,padding,borders are all part of what‘s known as the Box Model
surrounding that
【CSS】Beginner5:Margins&Padding,布布扣,bubuko.com
【CSS】Beginner5:Margins&Padding
原文：http://www.cnblogs.com/yzhen/p/3658865.html