flexbox_width-change-and-relayout-children.html

<!DOCTYPE html>
<html>
<head>
<title>CSS Flexbox: Flex children width when the parent width is changed</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-containers">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-direction-property">
<link rel="bookmark" href="https://bugs.webkit.org/show_bug.cgi?id=108231">
<meta name="assert" content="Flexbox should relayout flex children when width changes.">
<link href="support/flexbox.css" rel="stylesheet">
<style>
.flexitem {
    width: 100%;
    height: 3em;
    min-height: 3em;
}
.child {
    background-color: salmon;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script>
function change() {
  var container = document.getElementById('container');
  container.offsetWidth;
  container.style.width = "200px";
  checkLayout("#container");
}
</script>
</head>
<body onload="change()">
<div id=log></div>
<div id="container" style="width: 100px" data-expected-width="200">
  <div class="flexbox column" data-expected-width="200">
    <div class="flexitem" data-expected-width="200">
      <div class="child" data-expected-width="200">This div should be 200px wide.</div>
    </div>
  </div>
</div>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/flexbox_width-change-and-relayout-children.html