这是一段文字，让IE678去死吧

article{
	font-family: 华文黑体,微软雅黑;
}
@media (max-width: 799px) {
  article {
    font-size: 24px;
  }
  article:before{
   	content:'你的宽度800不到:字体只能显示24PX：';
  }
}
@media (min-width: 800px) and (max-width: 980px) {
  article {
    font-size: 30px;
  }
  article:before{
   	content:'800-980宽度:字体只能显示30PX：';
  }
}
@media (min-width: 980px) {
  article {
    font-size: 36px;
  }
  article:before{
   	content:'980px宽度以上:字体只能显示36PX：';
  }
}

@media only screen and (max-device-width:480px){
	article:after{
   		content:' 设备宽度480都不到哦';
	}
}
@media only screen and (min-device-width:480px) and (max-device-width:800px){
	article:after{
   		content:' 设备宽度有480-800';
	}
}
@media only screen and (min-device-width:800px){
	article:after{
   		content:' 设备宽度800+了';
	}
}
@media only screen and (min-resolution: 300dpi),only screen and (-webkit-min-device-pixel-ratio: 1.5),only screen and (min--moz-device-pixel-ratio: 1.5){
	article:after{
   		content:'300dpi，视网膜屏幕yeah，好屏幕!';
	}
}