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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/border-image-displayed-with-transparent-border-color-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>
  border-color: transparent should not hide the border-image
</title>
<style>
    div {
        width: 200px;
        height: 200px;
        margin: 20px;
        background-color: silver;
        border-image-source: url('./support/100x100-blue-and-orange.png');
        border-image-slice: 32;
        border-image-repeat: repeat;
        border-style: solid;
        border-width: 32px;
    }
</style>

This box should have a visible blue-orange border-image.
<div></div>