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什么是BFC？如何形成BFC？BFC有什么使用场景 #42

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ray-sh opened this issue Dec 9, 2019 · 0 comments
Open

什么是BFC？如何形成BFC？BFC有什么使用场景 #42

ray-sh opened this issue Dec 9, 2019 · 0 comments

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@ray-sh
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ray-sh commented Dec 9, 2019 •
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BlockFormattingContext，块级元素参与构建的、遵循一定规则的独立环境；参与的子项可能会创建新的块级格式化上下文，与外层上下文有同样的规则；3.新上下文中的子项与外层上下文的子项隔绝。

形成条件：1. 根元素；2. float属性不为none；3. position为absolute、fixed、sticky; 4. display为inline-block、table-cell; 5. display:flow-root; 6. overflow为hidden、scroll、auto。

使用场景： 1. 阻止父子外边距合并； 2. 阻止块级元素与浮动元素的覆盖； 3. 清除浮动，撑开浮动元素父容器。

来自饥人谷
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