RM8005: IE6 IE7 IE8(Q) 中行内元素后相邻的浮动元素在某些情况下会折行放置在之前行内元素所在行框的底部
标准参考
W3C CSS 2.1 规范文档里对于浮动元素与非浮动行内元素相邻时的情况有如下解释。以下是关键段落：
A floated box is shifted to the left or right until its outer edge touches the containing block edge or the outer edge of another float. If there’s a line box, the top of the floate
