<!doctype html>
<meta charset="utf-8">
<title>CSS Test: ::column updates computed style</title>
<link rel="help" href="https://www.w3.org/TR/css-multicol-2/#column-pseudo">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.green-column::column { color: red; }
.red-column::column { color: green; }
</style>
<div id="target"></div>
<script>
  test(() => {
  target.classList.add("green-column");
  assert_equals(getComputedStyle(target, "::column")