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css pseudo-classes and pseudo-elements
line-height (official definition of line height: two lines of text baseline aligned)
(Video tutorial recommendation: css video tutorial)
Target pseudo-class
:link (a:link 未访问的链接 浏览器有缓存!!所以刷新没用) a:active{color: ;} :active (长按住) :visited (已经访问的链接) :hover (鼠标放上去) :focus (获取用户焦点)
Pseudo element (it is an inline element that cannot set width and height)
::after (在元素后面添加内容) ::before (在元素前面添加内容) display:... inline-block(能够设置高度,和行内元素并排显示) inline block(独占一行) none(隐藏
css properties
继承(一个元素如果没有设置某个属性的值,那么就会跟随父属性的值。如果设置了,就用自己的值) color ,font-size line-height text-align 层叠(后面的样式会覆盖前面的样式) 当选择器相同时 后面的选择器会覆盖前面的 当选择器不同时,根据选择器的权重设置
List
ul(无序列表) ol (有序列表)
Table
table tr单元行 td单元格 boder 边框 cellpadding 单元格内部的间距 cellspacing 单元格之间的距离 width 表格的宽度 align 表格的水平对齐方式
Css element type division (according to whether the element can be displayed in one line)
块级元素 (独占父元素的一行) 常用的块级元素 ● div ● p ● h1-h6 ● ul--li ● table ● from
Inline-level elements (Can be displayed on the same line as other inline elements)
● img ● span ● a ● inupt
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