File: getComputedStyle-dynamic-subdoc.html

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<!doctype html>
<meta charset="utf-8">
<title>CSSOM: getComputedStyle cross-doc properly reflects media query changes</title>
<link rel="help" href="https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<iframe id="frm" style="width: 100px; height: 100px"></iframe>
<script>
test(function() {
  let frm = document.getElementById('frm');
  let frmDoc = frm.contentWindow.document;
  frmDoc.open();
  frmDoc.write('<style>body { color: red } @media all and (min-width: 101px) { body { color: green } }</style><body>Should be green</body>');
  frmDoc.close();

  document.body.offsetTop;

  assert_equals(
    getComputedStyle(frmDoc.body).color,
    "rgb(255, 0, 0)",
    "Initial color should be red"
  );

  frm.style.width = "200px";

  assert_equals(
    getComputedStyle(frmDoc.body).color,
    "rgb(0, 128, 0)",
    "style should have been updated to account for media query changes"
  );
}, "getComputedStyle cross-doc properly reflects media query changes");
</script>