文字两端对齐:
{
text-align: justify;
text-justify: inter-ideograph;
}
css跟设置顺序无关,与引入(编译)顺序有关,
绝对定位{position: absolute;}需要父标签属性有{position: relative;}
box-sizing:border-box width&height包括padding和border
CSS:
a,b是 a和b的样式相同
ab是同时满足a和b
a b是父级以上标签满足a,本身满足b的标签
a>b是父级标签满足a,本身满足b的标签
a+b是a和b为相邻标签,并且有相同的父标签
a~b是a后满足b的所有标签