块级元素和行内元素的定义 - 霸气侧漏小红花
根据CSS规范的规定，每一个网页元素都有一个display属性，用于确定该元素的类型，每一个元素都有默认的display属性值，比如div元素，它的默认display属性值为“block”，成为“块级”元素(block-level)；而span元素的默认display属性值为“inline”，称为“行内”元素。
div这样的块级元素，就会自动占据一定矩形空间，可以通过设置高度、宽度、内外边距等属性，来调整的这个矩形的样子；与之相反，像“span”“a”这样的行内元素，则没有自己的独立空间，它是依附于其他块级元素存在的，因此，对行内元素设置高度、宽度、内外边距等属性，都是无效的
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