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BFC面试简述
2022-07-04 19:04:00 【大鸡腿最好吃】
bfc简单来说就是块级格式化上下文,它是一个独立渲染区域,它的内部布局不受外部元素的影响
bfc触发条件
float:left、right
overflow:hidden
position:固定定位和绝对定位
display:flex
应用场景:
避免margin重叠
高度塌陷(子元素有浮动,父元素高度自适应,本来应该是子元素撑起父元素,但是并没有撑起)
浮动元素覆盖未浮动的元素(自适应性布局)
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