script-text-modifications-csp.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/semantics/scripting-1/the-script-element/script-text-modifications-csp.html - WPT Dashboard Interop Dashboard

<!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>