div需要重置吗？

看看所有常用标签的默认margin、padding？Demo戳这里 - -

当你每次看到为那一长串标签设置margin: 0; padding: 0; 的时候，你是否想看看哪些标签，在哪些浏览器里有默认值？

FF 32.0：

==== Margin ==== 
h1,21.4333px,0px,21.4333px,0px
h2,19.9167px,0px,19.9167px,0px
h3,18.7167px,0px,18.7167px,0px
h4,21.2833px,0px,21.2833px,0px
h5,22.1833px,0px,22.1833px,0px
h6,24.9667px,0px,24.9667px,0px
p,16px,0px,16px,0px
ul,16px,0px,16px,0px
ol,16px,0px,16px,0px
dl,16px,0px,16px,0px
dd,0px,0px,0px,40px
hr,8px,0px,8px,0px
pre,16px,0px,16px,0px
figure,16px,40px,16px,40px
fieldset,0px,2px,0px,2px
blockquote,16px,40px,16px,40px
textarea,1px,0px,1px,0px
textarea,1px,0px,1px,0px
==== Padding ====
ul,0px,0px,0px,40px
ol,0px,0px,0px,40px
th,1px,1px,1px,1px
td,1px,1px,1px,1px
td,1px,1px,1px,1px
fieldset,5.6px,10px,12px,10px
legend,0px,2px,0px,2px
input,2px,2px,2px,2px
select,1px,1px,1px,1px
option,0px,5px,0px,3px
option,0px,5px,0px,3px
textarea,2px,2px,2px,2px
button,0px,6px,0px,6px
select,1px,1px,1px,1px
option,0px,0px,0px,20px
option,0px,0px,0px,20px
textarea,2px,2px,2px,2px

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