mozilla-release/testing/web-platform/tests/content-security-policy/script-src/scriptnonce-changed-2.html

<!DOCTYPE html>
<head>
    <title>CSP inline script check is done at #prepare-a-script (nonce)</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <meta http-equiv="Content-Security-Policy" content="script-src 'self' 'nonce-abc' 'sha256-deadbeef'"></meta>
</head>
<!--
  "Should element's inline behavior be blocked by Content Security Policy?"
  is executed at the time of https://html.spec.whatwg.org/C/#prepare-a-script,
  not at https://html.spec.whatwg.org/C/#execute-the-script-block.
  So when nonce is modified after #prepare-a-script, the nonce BEFORE
  the modification is used for hash check.
-->
<script nonce="abc">
let log2 = '';
</script>

<!--  Execution order:
  async script is executed
  -> stylesheet is loaded
  -> inline script is executed. -->
<link rel="stylesheet" href="support/empty.css?dummy=4&pipe=trickle(d2)" type="text/css">
<script src="support/change-scriptnonce-before-execute.js?dummy=4&pipe=trickle(d1)" async></script>
<script id="scr2" nonce="wrong">log2 += 'scr2 executed';</script>

<script nonce="abc">
test(() => {
  assert_equals(log2, '');
}, 'scr2 nonce before modification should be blocked');
</script>