Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/fast/hidpi/image-set-list-style-image.html 

<!DOCTYPE html>
<script src="resources/srcset-helper.js"></script>

<style>
  ul {
    list-style-position: inside;
    padding: 0;
    margin: 0;
  }

  #standard {
    list-style-image: image-set(
      url('resources/deleteButton.png') 1x,
      url('resources/deleteButton-2x.png') 2x
    );
  }

  #prefixed {
    list-style-image: -webkit-image-set(
      url('resources/deleteButton.png') 1x,
      url('resources/deleteButton-2x.png') 2x
    );
  }
</style>

<ul id="standard">
  <li></li>
</ul>

<ul id="prefixed">
  <li></li>
</ul>