SOURCE

console 命令行工具 X clear

                    
>
console
<iframe src="http://wosai-statics.oss-cn-hangzhou.aliyuncs.com/opr-activities-h5/static/video-uni.mp4" allowfullscreen="true"> </iframe>
#d1
{
  width: 50px;
  height: 50px;
  background-color: aqua;
  display: inline-block;
}
#d2
{
  width: 100px;
  height: 50px;
  background-color: black;
  float: left;
  clear: both;
}
#d3
{
  width: 150px;
  height: 50px;
  background-color: orange;
  float: left;
}
#d4
{
  width: 300px;
  height: 50px;
  background-color: yellow;
  /*  clear:both;*/
}