File: important-vs-inline-001.html

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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS Cascade: inline style loses to !important</title>
  <link rel="help" href="https://www.w3.org/TR/css-cascade-4/#cascade-sort">
  <link rel="author" href="mailto:sesse@chromium.org">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <style>
    .outer {
       opacity: 0.5 !important;
    }
  </style>
</head>
<body>
  <p class="outer" id="el">Test passes if this text is semi-transparent.</p>
</body>
<script>
test(() => {
  el.offsetTop;
  assert_equals(getComputedStyle(el).opacity, "0.5", "style is set correctly");
});
test(() => {
  el.offsetTop;
  el.style.opacity = 0.75;
  assert_equals(getComputedStyle(el).opacity, "0.5", "!important has higher priority than adding inline style");
});
test(() => {
  el.offsetTop;
  el.style.opacity = 1.0;
  assert_equals(getComputedStyle(el).opacity, "0.5", "!important has higher priority than modifying inline style");
});
test(() => {
  el.offsetTop;
  el.style.opacity = null;
  assert_equals(getComputedStyle(el).opacity, "0.5", "!important has higher priority than removing inline style");
});
</script>
</html>