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Test Info:

<!DOCTYPE html>
<!-- Test verifies that a stylesheet mislabeled as html won't execute with and
without CORB if the nosniff response header is present.
The expected behavior is covered by the Fetch spec at
See also the following tests:
- fetch/nosniff/stylesheet.html
-->
<meta charset="utf-8">
<title>CSS is not applied (because of nosniff + non-text/css headers)</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<!-- Default style that will be applied if the external stylesheet resource
below won't load for any reason. This stylesheet will set h1's
color to green (see |default_color| below). -->
<style>
h1 { color: green; }
</style>
<!-- This stylesheet (if loaded) should set h1#header's color to red
(see |external_color| below). -->
<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
<link rel="stylesheet" type="text/css"
<body>
<h1 id="header">Header example</h1>
<p>Paragraph body</p>
</body>
<script>
test(() => {
let style = getComputedStyle(document.getElementById('header'));
const external_color = 'rgb(255, 0, 0)'; // red
const default_color = 'rgb(0, 128, 0)'; // green
assert_equals(style.getPropertyValue('color'), default_color);
assert_not_equals(style.getPropertyValue('color'), external_color);
});
</script>