<div class="clip-wrap">
  <img src="http://karenmenezes.com/shapes-polygon/clip-demo.jpg" alt="demo-clip-css" class="element" width="150" height="150"></div>

<svg class="clip-svg" width="0" height="0">
  <defs>
    <clipPath id="clip-shape" clipPathUnits="objectBoundingBox" >
      <polygon points="0 1, 0 0, 1 0, 0.8 1" />
    </clipPath>
  </defs>
</svg>
.clip-wrap {
  text-align: center;  
}

.element {
  -webkit-clip-path: polygon(0 100%, 0 0, 100% 0, 80% 100%);
  clip-path: polygon(0 100%, 0 0, 100% 0, 80% 100%);
  -webkit-clip-path: url("#clip-shape"); /* required for Webkit/Blink browsers if you're using only inline SVG clipping paths, but not CSS clip-path */
  clip-path: url("#clip-shape");
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.