<!doctype html><html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> .input200{width:190px;} .orgClumn{float:left;display:block;min-width:250px;} .orgClumn .orgClumnName{display:block;width:75px;float:left;} </style> </head> <body><span style="width: 546px; height: 100px; padding: 10px 20px;border:1px solid;display:block;"> <span class="orgClumn"><span class="orgClumnName">a</span><input class="input200" type="text"></span> <span class="orgClumn"><span class="orgClumnName">b</span><input class="input200" style="border:1px solid;" type="text"></span> <span class="orgClumn"><span class="orgClumnName">c</span><input class="input200" type="text"></span> <span class="orgClumn"><span class="orgClumnName">d</span><input class="input200" type="text"></span> <span class="orgClumn"><span class="orgClumnName">e</span><input class="input200" type="text"></span> <span class="orgClumn"><span class="orgClumnName">f</span><input class="input200" type="text"></span> </span> </body></html> c这个元素直接出现在了右边，为什么不是左边，去掉b元素后边的border属性之后一切正常，求解释！
style="border:1px solid;" 这个是罪魁祸首
回复讨论(解决方案)
浏览器input元素默认边框宽度与你设置其中一个输入框的宽度不一样. 这边测试浏览器默认为2px,于是:
当span c向左浮动时,会碰到span a后的输入框，最终位置就是停在了span b的下面了
1，浏览器input默认样式是2px inset，
2，你手动设置 b处的input style="border:1px solid;"后，使b块高度变小了，
3，对于float：left的元素来说，它总是先试图排在前一个元素的右边，如果右边宽度不够，它会排到下一行的最左边。
所以对于你的这种情况，c它排在b的下边就不奇怪了。
要想按让它按预想的对齐，解决方法也很简单：
1，可以设置b处的input 的bordex为2即 style="border:2px solid;"
或者 2，你可以给orgClumn设置一个高度,
.orgClumn{float:left;display:block;min-width:250px;height:30px;}
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