File: flexbox-item-align-self-dynamic-pos-001.html

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<!DOCTYPE HTML>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<html><head>
  <title>CSS Flexbox Test: dynamic change .left on abs.pos. item w. align-self:center</title>
  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1405319">
  <link rel="help" href="https://drafts.csswg.org/css-align-3/#propdef-align-self">
  <link rel="match" href="flexbox-item-align-self-dynamic-pos-001-ref.html">
  <style type="text/css">
html,body {
  color:black; background-color:white; font:16px/1 monospace; padding:0; margin:0;
}

.flexbox {
  display: flex;
  position: relative;
  height: 100px;
}

#item {
  background: grey;
  position: absolute;
  align-self: center;
  left: 10px;
}

</style>
</head>
<body>

<div class="flexbox">
  <div id="item">X</div>
</div>

<script>
  document.body.offsetLeft;
  var items = Array.prototype.slice.call(document.querySelectorAll('#item'));
  items.map(item =>  item.style.left = "20px");
  document.body.offsetLeft;
</script>

</body>
</html>