File: column-updates-computed-style.html

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<!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").color, "rgb(255, 0, 0)");
  target.classList.remove("green-column");
  target.classList.add("red-column");
  assert_equals(getComputedStyle(target, "::column").color, "rgb(0, 128, 0)");
  }, "::column updates computed style on its originating element");
</script>