css/css-backgrounds/background-clip-content-box-002.html

<!doctype html>
<title>background-clip: content-box with fractional width/position</title>
<link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#the-background-clip">
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<style>
.back {
  background-color: red;
  width: 100px;
  display: flex;
}

.left {
  flex-basis: 50%;
  border-left: 5px solid green;
}

.right {
  flex-basis: 50%;
  border-right: 6px solid green;
}

.left, .right {
  background-color: green;
  background-clip: content-box;
  height: 100px;
}
</style>
<p>Test passes if there is a filled green square.</p>
<div class="back">
  <div class="left"></div>
  <div class="right"></div>
</div>