angular old version 1.x

https://devdocs.io/angularjs~1.5-guide/

OLD angular is below
https://angularjs.org/

How to set default img for html tag with CSS solution 设定HTML img预设图的CSS解决方案

https://jsfiddle.net/diadio/3k94oy1w/18/

HTML
<img src='google.com/ggg.png' class='b' alt=' '>

CSS
.b{
  display: block;
  border: 1px solid blue;
  position: relative;
  width: 500px;
  height: 300px;
}
.b::before{
  display: block;
  position: absolute;
  z-index: 5;
  left: 0;
  top: 0;
  width: 500px;
  height: 300px;
  background: url(https://www.wowza.com/uploads/images/WebRTC.gif) center top;
  content: ' ';

}