html - 哪些情况下float会失效？

Question

比较div没有设宽度或高度的时候，float是否会失效。 还有哪些情况会失效的？

阿神 · Answer

你好！p没有设宽或高时，若里面也没有任何占宽高元素或文字内容，则该p不显示，但float仍生效。

失效情况：两个同级p，第一个设置float:left,第二个未设置，则会第一个脱离了文档流，也就是说第二个p无视第一个的存在，将与之发生重叠

PHPz · Answer

你所指的失效是什么意思？

大家讲道理 · Answer

目前只知道float在绝对定位和display为none时不生效，其他的还希望大牛们能解答

PHP中文网 · Answer

Properties not affecting flexible boxes

Because flexible boxes use a different layout algorithm, some
properties do not make sense on a flex container:

column-* properties of the multiple column module have no effect on a flex item.

float and clear have no effect on a flex item. Using float causes the display property of the element to compute to block.

vertical-align has no effect on the alignment of flex items.

高洛峰 · Answer

绝对定位时失效

ringa_lee · Answer

display:flex时也会失效，可以用margin-left:auto解决

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