在CSS盒模型中，HTML元素可以被分为几个不同的类型。这这些类型中，有两个最常见的类型：块级(block-level)元素和内联(Inline)元素。
作为一名后端程序员，经常会接触到这些概念。以前也仅仅知道，块级元素和内联元素的简单区别。现在的工作中已经离不开前端了，所以想深入了解下块级元素和内联元素的区别，为之后的前端学习多打一点基础。
块级元素
块级元素具有以下特点:
- 如果未设置宽度，宽度会自动时应到它父级元素的宽度。
- 如果未设置高度，高度默认为其子元素的高度(前提是子元素没有设置浮动和position定位)。
- 可以设置margin/padding。
- 默认的，块级元素独占一行。
- 会忽略vertical-align属性。
因此，如果我们想让块级元素自动适应父元素的宽度，就不要给块级元素设置宽度或者设置一个 100%的宽度，这样反而不好维护。
HTML中常见的块级元素:
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