CSS3中的属性选择器

id=sectiona

id=section1-1

id=section1-1-1c

id=section1-1-2d

id=section1-2e

id=section1-2-1

id=section2

id=section2-1

id=section2-2

id=section2_2

id=section2_2

id=section2_2

id=section2_3