wpt/css/css-position/static-position/top-layer-box-uses-icb-htb-ltr.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>

<html class="reftest-wait">

<title>Boxes in the top layer use the initial containing block as their static-position rectangle.</title>

<link rel="help" href="https://drafts.csswg.org/css-position-3/#staticpos-rect">
<link rel="match" href="top-layer-box-uses-icb-top-left-ref.html">
<link rel="author" title="Kiet Ho" href="mailto:kiet.ho@apple.com">

<style>
  :root {
    writing-mode: horizontal-tb;
    direction: ltr;
  }

  body {
    margin: 0;
    padding: 0;
  }

  #reference {
    width: 100px;
    height: 100px;
    background: red;
  }

  #popover {
    width: 100px;
    height: 100px;
    background: green;

    /* Override popover UA style */
    border: none;
    padding: 0;

    inset: auto;
  }
</style>

<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>

<div id="reference"></div>
<!-- This green box should fully cover the red box above. -->
<div id="popover" popover></div>

<script>
  document.getElementById("popover").showPopover();
  waitForAtLeastOneFrame().then(takeScreenshot);
</script>

</html>