数据分析师2017-09-30 23:30:02
Still confused about the group selector? -PHP Chinese website Q&A-Still not sure about the group selector? -PHP Chinese website Q&A
Please watch and learn.
迷茫2016-12-21 17:32:11
因为题目要求是第一段和第二段中<span>标签内元素颜色为绿色，用p,span{color:green;}就显示段落颜色都为绿色了，不符合题目要求。用.first,#second span{color:green;}是最准确的
