css/css-overflow/overflow-empty-child-box.html

<!DOCTYPE html>
<!--
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     http://creativecommons.org/publicdomain/zero/1.0/
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<html>
  <meta charset="utf-8">
  <title>CSS Overflow Test: Testing an empty child box and its container's scrollable overflow area</title>
  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
  <link rel="author" title="Mozilla" href="https://www.mozilla.org/">
  <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#scrollable">
  <meta name="assert" content="This test verifies that an empty child box shouldn't contribute to its parents scrollable overflow area.">

  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="/resources/check-layout-th.js"></script>

  <style>
  .container {
    border: 1px solid black;
    width: 200px;
    height: 100px;
  }

  .empty {
    position: relative;
    width: 0px;
    height: 0px;
    left: 500px;
    top: 300px;
    box-shadow: 0 0 0 10px blue;
  }
  </style>

  <body onload="checkLayout('.container')">
    <p>You should see no scrollbars in these container because an empty child
    box shouldn't contribute to its parents scrollable overflow area. </p>

    <div class="container" style="overflow: visible"
         data-expected-scroll-width="200" data-expected-scroll-height="100">
      <div class="empty"></div>
    </div>

    <div class="container" style="overflow: auto"
         data-expected-scroll-width="200" data-expected-scroll-height="100">
      <div class="empty"></div>
    </div>

    <div class="container" style="overflow: hidden"
         data-expected-scroll-width="200" data-expected-scroll-height="100">
      <div class="empty"></div>
    </div>

    <div class="container" style="overflow: clip"
         data-expected-scroll-width="200" data-expected-scroll-height="100">
      <div class="empty"></div>
    </div>
  </body>
</html>