chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/clip-005.html

<!doctype html>
<meta charset="utf-8">
<title>CSS Test: overflow:clip doesn't affect the box' own outline</title>
<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1531609">
<link rel="help" href="https://drafts.csswg.org/css-overflow/#valdef-overflow-clip">
<link rel="match" href="clip-005-ref.html">
<style>
  .outer {
    width: 30px;
    height: 30px;
    padding: 10px;
    margin-left: 100px;
    margin-top: 100px;
    background: black;
    outline: 2px solid grey;
  }

  .inner {
    position: relative;
    top: -20px;
    left: -40px;
    background: blue;
    height: 100px;
    width: 100px;
    opacity: 0.5;
  }
</style>
<!-- there should be no overflow -->
<div class="outer" style="overflow:clip">
  <div class="inner"></div>
</div>

<!-- there should be overflow in the vertical dimension, but not horizontally -->
<div class="outer" style="overflow-x:clip">
  <div class="inner"></div>
</div>

<!-- there should be overflow in the horizontal dimension, but not vertically -->
<div class="outer" style="overflow-y:clip">
  <div class="inner"></div>
</div>