匹配父元素的最后一个子元素E的选择符是()
A. E:first-child
B. E:last-child
C. E:only-child
D. E:nth-child(n)
匹配父元素仅有的一个子元素E的选择符是()
A. E:first-child
B. E:last-child
C. E:only-child
D. E:nth-child(n)
匹配父元素的第n个子元素E的选择符是()
A. E:first-child
B. E:last-child
C. E:only-child
D. E:nth-child(n)
匹配父元素的倒数第n个子元素E的选择符是()
A. E:last-child
B. E:only-child
C. E:nth-child(n)
D. E:nth-last-child(n)