chromium/third_party/blink/web_tests/fast/hidpi/image-set-shape-outside.html

<!DOCTYPE html>
<style>
  #standard {
    shape-outside: image-set(
      url('resources/deleteButton.png') 1x,
      url('resources/deleteButton-2x.png') 2x
    );
  }

  #prefixed {
    -webkit-shape-outside: -webkit-image-set(
      url('resources/deleteButton.png') 1x,
      url('resources/deleteButton-2x.png') 2x
    );
  }

  div {
    width: 60px;
    height: 1em;
    float: left;
  }
</style>

<div id="standard"></div>
<img width=30 src="resources/deleteButton.png">

<br>

<div id="prefixed"></div>
<img width=30 src="resources/deleteButton.png">