1回答

• 

  Jakes

  2015-08-01 12:51:13

  涉及到margin折叠。

  W3C：http://www.w3.org/TR/CSS2/tables.html#anonymous-boxes

  Any table element will automatically generate necessary anonymous table objects around itself, consisting of at least three nested objects corresponding to a 'table'/'inline-table' element, a 'table-row' element, and a 'table-cell' element.

  所以display:table 会产生匿名的table-cell元素，进而产生BFC从而避免margin折叠。
  

  It does not need to be display: table. The difference, however, is worth to be mentioned: If you use display: block instead of display: table, your margins will collapse as usual. If you use display: table, however, you will lose margin collapse between siblings and the first/last children of the element where you've applied the clearfix on, which might or might not be a desired feature.

  代码演示
  

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