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class="breadcrumbs__link">模拟题一</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">样式:BFC 的形成和作用</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>BFC 的形成和作用</h1><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="相关问题">相关问题<a href="#相关问题" class="hash-link" aria-label="Direct link to 相关问题" title="Direct link to 相关问题"></a></h2><ul><li>BFC 有什么用,如何触发</li><li>谈谈你对 BFC 的理解</li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="回答关键点">回答关键点<a href="#回答关键点" class="hash-link" aria-label="Direct link to 回答关键点" title="Direct link to 回答关键点"></a></h2><p><code>盒模型</code> <code>视觉格式化模型</code> <code>包含块</code> <code>正常流</code></p><p><strong>BFC 是什么</strong></p><p>BFC 全称为 block formatting context,中文为“块级格式化上下文”。它是一个只有块级盒子参与的独立块级渲染区域,它规定了内部的块级盒子如何布局,且与区域外部无关。</p><p><strong>BFC 有什么用</strong></p><ul><li>修复浮动元素造成的高度塌陷问题。</li><li>避免非期望的外边距折叠。</li><li>实现灵活健壮的自适应布局。</li></ul><p><strong>触发 BFC 的常见条件</strong></p><ul><li><<!-- -->html<!-- -->><!-- --> 根元素。</li><li>float 的值不为 none。</li><li>position 的值不为 relative 或 static。</li><li>overflow 的值不为 visible 或 clip(除了根元素)。</li><li>display 的值为 table-cell,table-caption,或 inline-block 中的任意一个。</li><li>display 的值为 flow-root,或 display 值为 flow-root list-item。</li><li>flex items,即 display 的值为 flex 或 inline-flex 的元素的直接子元素(该子元素 display 不为 flex,grid,或 table)。</li><li>grid items,即 display 的值为 grid 或 inline-grid 的元素的直接子元素(该子元素 display 不为 flex,grid,或 table)。</li><li>contain 的值为 layout,content,paint,或 strict 中的任意一个。</li><li>column-span 设置为 all 的元素。</li></ul><p><strong>提示</strong>:<code>display: flow-root</code>,<code>contain: layout</code> 等是无副作用的,可在不影响已有布局的情况下触发 BFC。</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="知识点深入">知识点深入<a href="#知识点深入" class="hash-link" aria-label="Direct link to 知识点深入" title="Direct link to 知识点深入"></a></h2><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="1-前置知识点">1. 前置知识点<a href="#1-前置知识点" class="hash-link" aria-label="Direct link to 1. 前置知识点" title="Direct link to 1. 前置知识点"></a></h3><p><strong>盒模型(box model)</strong></p><p><strong>盒模型</strong>描述了一个由元素生成的矩形盒子,<strong>视觉格式化模型</strong>决定这些盒子的大小、位置以及属性(例如颜色、背景、边框尺寸等等)。</p><p>盒子的具体构成如下图所示:</p><p><img loading="lazy" src="https://www.w3.org/TR/CSS2/images/boxdim.png" alt="Box model" class="img_ev3q"></p><p><strong>术语解析</strong></p><p>由于视觉格式化模型描述中,有许多相近的术语,在此先行列出解释。</p><ul><li>box(盒子):一个抽象概念,在画布上占据一块空间,通常由元素(element)生成。一个元素可能生成多个盒子(如伪元素、list-item 元素)。</li><li>principal box(主要盒子):元素生成的多个盒子中,用来包含它的后代盒子和它生成的内容的盒子,也是参与任何定位方案的盒子。</li><li>block-level box(块级盒子):参与 BFC 布局的盒子,通常由块级元素生成。</li><li>block container box(块容器):在 CSS2.2 中,除了 table box 或替换元素的主要盒子,一个块级盒子也是块容器,但不是所有的块容器都是块级盒子(如非替换内联块盒子)。块容器主要侧重于其子元素的定位、布局。</li><li>block box(块盒子):如果一个块级盒子同时也是块容器,则可以称作块盒子。</li><li>block(块):当没有歧义时,作为 block box, block-level box 或 block container box 的简写。</li></ul><p>(注:盒子有“块盒子”和“块级盒子”,元素只有“块级元素”,而没有“块元素”)</p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="2-视觉格式化模型visual-formatting-model">2. 视觉格式化模型(visual formatting model)<a href="#2-视觉格式化模型visual-formatting-model" class="hash-link" aria-label="Direct link to 2. 视觉格式化模型(visual formatting model)" title="Direct link to 2. 视觉格式化模型(visual formatting model)"></a></h3><p>视觉格式化模型描述了用户代理(如浏览器)在可视化媒体(如显示器)上处理文档树(document tree)的过程。下面各小节是视觉格式化模型中与 BFC 强相关的描述:</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="21-包含块containing-block">2.1 包含块(containing block)<a href="#21-包含块containing-block" class="hash-link" aria-label="Direct link to 2.1 包含块(containing block)" title="Direct link to 2.1 包含块(containing block)"></a></h4><p>大部分情况下,包含块是一个由元素最近的祖先块容器的内容区域(content area)确定的矩形区域,包含块本身不是盒子,是一个矩形区域。元素的大小,位置,及偏移等布局信息根据包含块的尺寸进行计算。</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="22-正常流normal-flow">2.2 正常流(normal flow)<a href="#22-正常流normal-flow" class="hash-link" aria-label="Direct link to 2.2 正常流(normal flow)" title="Direct link to 2.2 正常流(normal flow)"></a></h4><p>正常流是浏览器的默认布局方式。在正常流中的盒子,属于 BFC,IFC,或其他格式化上下文之一。</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="23-格式化上下文formatting-context">2.3 格式化上下文(formatting context)<a href="#23-格式化上下文formatting-context" class="hash-link" aria-label="Direct link to 2.3 格式化上下文(formatting context)" title="Direct link to 2.3 格式化上下文(formatting context)"></a></h4><p><strong>格式化上下文</strong>是一系列相关盒子进行布局的环境。不同的格式化上下文有不同的布局规则。目前常见的格式化上下文有以下这些:</p><ul><li>块级格式化上下文(BFC,block formatting context)。</li><li>内联格式化上下文(IFC,inline formatting context)。</li><li>弹性格式化上下文(FFC,flex formatting context),在 CSS3 中定义。</li><li>栅格格式化上下文(GFC,grid formatting context),在 CSS3 中定义。</li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="24-独立格式化上下文independent-formatting-context">2.4 独立格式化上下文(independent formatting context)<a href="#24-独立格式化上下文independent-formatting-context" class="hash-link" aria-label="Direct link to 2.4 独立格式化上下文(independent formatting context)" title="Direct link to 2.4 独立格式化上下文(independent formatting context)"></a></h4><p>一个盒子要么建立一个新的独立格式化上下文,要么延续其包含块的格式化上下文。除了特殊说明,建立新的格式化上下文就是在建立一个独立格式化上下文。</p><p>当一个盒子建立一个独立格式化上下文时,它创建了一个新的独立布局环境。除了通过改变盒子本身的大小,盒子内部的后代不会影响格式化上下文外部的规则和内容,反之亦然。</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="25-块级格式化上下文规范及解析">2.5 块级格式化上下文规范及解析<a href="#25-块级格式化上下文规范及解析" class="hash-link" aria-label="Direct link to 2.5 块级格式化上下文规范及解析" title="Direct link to 2.5 块级格式化上下文规范及解析"></a></h4><p>根据 W3C CSS2.1 视觉格式化模型一章的定义,BFC 相关规范描述如下:</p><ol><li>浮动元素,绝对定位元素,不是块级盒子的块级容器(如 inline-block,table-cells,table-captions)以及 overflow 值不为 visible 的块级盒子,都会为他们的内容创建 BFC(注:触发 BFC 的条件)。</li><li>在 BFC 中,盒子从包含块的顶部开始,在垂直方向上一个接一个的排列。相邻盒子之间的垂直间隙由它们的 margin 值决定。在同一个 BFC 中,相邻块级盒子的垂直外边距会合并(注:参与 BFC 布局的都是块级元素)。</li><li>在 BFC 中,每一个盒子的左外边缘(margin-left)会触碰到包含块的左边缘。即使是存在浮动元素也是如此,除非该盒子建立了一个新的 BFC。</li></ol><p>结合规范第三点与<strong>独立格式化上下文</strong>的知识,我们可以有以下推论:</p><ol><li>BFC 内外互不影响。<ol><li>BFC 包含内部的浮动(解决内部浮动元素导致的高度塌陷)。</li><li>BFC 排斥外部的浮动(触发 BFC 的元素不会和外部的浮动元素重叠)。</li><li>外边距折叠的计算不能跨越 BFC 的边界。</li></ol></li><li>各自创建了 BFC 的兄弟元素互不影响(注:在水平方向上多个浮动元素加一个或零个触发 BFC 的元素可以形成多列布局)。</li></ol><p>通过 BFC 可以实现灵活健壮的自适应布局,在一行中达到类似 flexbox 的效果,示例如下:</p><p><a href="https://codepen.io/suzukaze-yoru/pen/ZEKKxJm?editors=1100" target="_blank" rel="noopener noreferrer">两栏自适应布局</a></p><p><img loading="lazy" src="https://user-images.githubusercontent.com/4338052/126038001-1828c607-212c-4427-9006-6ee61f1c3979.gif" alt="two-col" class="img_ev3q"></p><p><a href="https://codepen.io/suzukaze-yoru/pen/poPPLWZ?editors=1100" target="_blank" rel="noopener noreferrer">多列自适应布局</a></p><p><img loading="lazy" src="https://user-images.githubusercontent.com/4338052/126038024-1160aa58-d21d-48a0-b076-650c4ba6f00d.gif" alt="multi-col" class="img_ev3q"></p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="参考资料">参考资料<a href="#参考资料" class="hash-link" aria-label="Direct link to 参考资料" title="Direct link to 参考资料"></a></h2><ol><li><a href="https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flow_Layout/Intro_to_formatting_contexts" target="_blank" rel="noopener noreferrer">块级格式化上下文</a></li><li><a href="https://developer.mozilla.org/en-us/docs/web/css/containing_block" target="_blank" rel="noopener noreferrer">包含块:MDN</a></li><li><a href="https://www.w3.org/tr/css22/visudet.html#containing-block-details" target="_blank" rel="noopener noreferrer">包含块:W3C</a></li><li><a href="https://developer.mozilla.org/en-us/docs/web/css/visual_formatting_model" target="_blank" rel="noopener noreferrer">视觉格式化模型:MDN</a></li><li><a href="https://www.w3.org/tr/css22/visuren.html" target="_blank" rel="noopener noreferrer">视觉格式化模型:W3C</a></li><li><a href="https://developer.mozilla.org/en-us/docs/web/css/css_box_model/introduction_to_the_css_box_model" target="_blank" rel="noopener noreferrer">盒模型:MDN</a></li><li><a href="https://www.w3.org/tr/css22/box.html" target="_blank" rel="noopener noreferrer">盒模型:W3C</a></li></ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/awesome-interview/book1/js-module-specs"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">基础:前端模块化规范</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/awesome-interview/book1/network-security"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">网络:前端安全</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#相关问题" class="table-of-contents__link toc-highlight">相关问题</a></li><li><a href="#回答关键点" class="table-of-contents__link toc-highlight">回答关键点</a></li><li><a href="#知识点深入" class="table-of-contents__link toc-highlight">知识点深入</a><ul><li><a href="#1-前置知识点" class="table-of-contents__link toc-highlight">1. 前置知识点</a></li><li><a href="#2-视觉格式化模型visual-formatting-model" class="table-of-contents__link toc-highlight">2. 视觉格式化模型(visual formatting model)</a><ul><li><a href="#21-包含块containing-block" class="table-of-contents__link toc-highlight">2.1 包含块(containing block)</a></li><li><a href="#22-正常流normal-flow" class="table-of-contents__link toc-highlight">2.2 正常流(normal flow)</a></li><li><a href="#23-格式化上下文formatting-context" class="table-of-contents__link toc-highlight">2.3 格式化上下文(formatting context)</a></li><li><a href="#24-独立格式化上下文independent-formatting-context" class="table-of-contents__link toc-highlight">2.4 独立格式化上下文(independent formatting context)</a></li><li><a href="#25-块级格式化上下文规范及解析" class="table-of-contents__link toc-highlight">2.5 块级格式化上下文规范及解析</a></li></ul></li></ul></li><li><a href="#参考资料" class="table-of-contents__link toc-highlight">参考资料</a></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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