html，css基础笔记

伪类选择器，按钮和连接.......................................

css 浮动和对齐..........................................

css背景呵边框..........................................

css盒模型和margin外边距/padding内边距.......................

css颜色设定的三种方法......................................

css字体属性， 字符实体和符号......................................

css选择器...................................................

字符实体和符号..............................................

div标签和span标签，id属性和class属性的区别。.....................

块级元素和内联元素的区别...............................................