twitter bootstrap - css width % working incorrectly; longer than necessary -

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i have set of images want stacked 1 on other. working bootstrap, , kept parent div @ center of jumbotron. div encloses image, , absolutely divs further contain images. however, when apply width:100% child divs, end being longer/

this js-fiddle code snippet: https://jsfiddle.net/yhl6tndn/

i led believe % measured respect parent container (#major in example). width , height of #semimajor should equal, since width , height of #major equal.

on checking actual sizes, find either

  1. the entire width of the parent of #major being used calculate width of #semimajor

or

  1. the width of #majoris being calculated margins. box-sizing properties set border-box.

what should happen #semimajor should measure 150px 150px. cannot spot error in code though.

edit 1: position: relative on #major removes issue, still not understand why must case.

when used position: absolute, comes out of normal flow of document , positioned respect body , comes out of #major.

notice when have added position: relative, positioned absolutely nearest relatively positioned parent container i.e. #major, child divs don't go past #major.


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