wpt/css/css-multicol/multicol-dynamic-add-004.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html class="reftest-wait">
  <meta charset="utf-8">
  <title>CSS Multi-column Layout Test: Append float element to block with floating pseudo-elements in multi-column context</title>
  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/">
  <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1645714">
  <link rel="match" href="multicol-dynamic-add-004-ref.html">
  <meta name="assert" content="This test checks that dynamically appending a float element to a block container with floating ::before and ::after pseudo-elements in a multi-column context renders correctly.">

  <script>
  function runTest() {
    document.body.offsetHeight;

    var nav = document.createElement("nav");
    nav.append("text");

    var container = document.getElementById("container");
    container.append(nav);

    document.documentElement.removeAttribute("class");
  }
  </script>

  <style>
  .columns {
    columns: 2;
    column-fill: auto;
    width: 100px;
    height: 10px;
  }
  #container::before, #container::after {
    float: left;
    content: "";
    width: 10px;
    height: 20px;
  }
  nav {
    float: left;
  }
  </style>

  <body onload="runTest();">
    <div class="columns">
      <div id="container"></div>
    </div>
  </body>
</html>