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<!doctype html>
<head>
<meta charset=utf-8>
<title>Modify HTMLScriptElement's text after #prepare-a-script that violates CSP</title>
<link rel=help href="https://html.spec.whatwg.org/multipage/scripting.html#prepare-a-script">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta http-equiv="content-security-policy" content="script-src
'nonce-allow'
'sha256-2+5xh6b9uuIi4GaJtmHWtgR2nwRXJpBtMY4nVaOBpfc='
">
<!-- The hash is that of the original content of `script0`. -->
<script nonce="allow">
window.t = async_test("Modify inline script element's text " +
"after prepare-a-script before evaluation (CSP)");
const updatedText =
't.unreached_func("CSP check was done against the original text but the updated text was evaluated")();';
function changeScriptText() {
document.querySelector('#script0').textContent = updatedText;
}
t.step_timeout(changeScriptText, 500);
</script>
<!-- This is "a style sheet that is blocking scripts" and thus ... -->
<link rel="stylesheet" href="/common/slow.py?pipe=trickle(d1)"></link>
<!-- This inline script becomes a parser-blocking script, and thus
the step_timeout is evaluated after script0 is inserted into DOM,
prepare-a-script'ed, but before its evaluation. -->
<script id="script0">
t.step(() => {
// When this is evaluated after the stylesheet is loaded,
// script0's textContent is modified by the async script above,
// but the evaluated script is still the original script here,
// not what is overwritten, because "child text content" is taken in
// #prepare-a-script and passed to "creating a classic script".
var s = document.getElementById('script0');
assert_equals(s.textContent, updatedText,
"<script>'s textContent should be already modified");
t.done();
});
</script>
<script nonce="allow">
// If this makes the test fail, it indicates `script0` (the original or updated
// text) was not evaluated, probably blocked by CSP that was checked against the
// updated text.
t.unreached_func("CSP check was done against the updated text")();
</script>
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