设计场景
- 如果我们不给元素指定固定的高度(height),它会根据其内容的高度自适应。我们希望宽度(width)也具有类似的行为
应用场景
我们用一幅图来展示实际的应用场景:
perfect.png
分析:
- 宽度由 内部因素 来决定,而不是由 外部因素 来决定的
- 水平居中
老式解决方案
-
代码结构
<p>文本</p><figure> <img src="" alt="" style="max-width:90%" height="" /> <figcaption>标题/描述</figcaption></figure><p>文本</P>
为了得到正确的宽度,我们给 figure 元素浮动,但却引发了新的问题,整个布局模式改变了
float.png
- 对figure元素应用 display: inline-block 让它根据内容来决定自身的尺寸,这样虽然可以达到正确的宽度,但在水平居中上却让我们实现起来有点繁琐:我们需要对父元素应用 text-align: cener 属性,然后对不需要居中的子元素都设置 text-align: left 属性
inline-block.png
新式解决方案
figure { max-width: 502px; max-width: min-content; margin: 20px auto;}figure > img { max-width: inherit;}
说明:
- min-content 属性,它获取的是这个容器内部最大的不可断行元素的宽度(最宽的单词、图片或具有固定宽度的元素),在这里起到了很重要的作用
- 为浏览器的兼容做了一个回退样式
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