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Test Info:

<!DOCTYPE html>
<script nonce="123" src="/resources/testharness.js"></script>
<script nonce="123"src="/resources/testharnessreport.js"></script>
<script nonce="123"src="/content-security-policy/support/testharness-helper.js"></script>
<script nonce="123">
// CSP insists the "trusted-types: ..." directives are deliverd as headers
// (rather than as "<meta http-equiv" tags). This test assumes the following
// headers are set in the .headers file:
// Content-Security-Policy: script-src 'unsafe-inline'; report-uri ...
// Content-Security-Policy: object-src 'none'
// Content-Security-Policy: require-trusted-types-for 'script'
// The second rule is there so we can provoke a CSP violation report at will.
// The intent is that in order to test that a violation has *not* been thrown
// (and without resorting to abominations like timeouts), we force a *another*
// CSP violation (by violating the object-src rule) and when that event is
// processed we can we sure that an earlier event - if it indeed occurred -
// must have already been processed.
// Return function that returns a promise that resolves on the given
// violation report.
// how_many - how many violation events are expected.
// filter_arg - iff function, call it with the event object.
// Else, string-ify and compare against event.originalPolicy.
function promise_violation(filter_arg) {
return _ => new Promise((resolve, reject) => {
function handler(e) {
let matches = (filter_arg instanceof Function)
? filter_arg(e)
: (e.originalPolicy.includes(filter_arg));
if (matches) {
document.removeEventListener("securitypolicyviolation", handler);
document.addEventListener("securitypolicyviolation", handler);
// Like assert_throws_*, but we don't care about the exact error. We just want
// to run the code and continue.
function expect_throws(fn) {
try { fn(); assert_unreached(); } catch (err) { /* ignore */ }
// A sample policy we use to test trustedTypes.createPolicy behaviour.
const id = x => x;
const a_policy = {
createHTML: id,
createScriptURL: id,
createURL: id,
createScript: id,
const scriptyPolicy = trustedTypes.createPolicy('allowEval', a_policy);
// Provoke/wait for a CSP violation, in order to be sure that all previous
// CSP violations have been delivered.
function promise_flush() {
return promise_violation("object-src 'none'");
function flush() {
expect_throws(_ => {
var o = document.createElement('object');
o.type = "application/x-shockwave-flash";
window.script_run_beacon = 'never_overwritten';
promise_test(t => {
let p = Promise.resolve()
.then(promise_violation("require-trusted-types-for 'script'"))
expect_throws(_ => eval('script_run_beacon="should not run"'));
assert_equals(script_run_beacon, 'never_overwritten');
return p;
}, "Trusted Type violation report: evaluating a string violates both script-src and trusted-types.");
promise_test(t => {
let p = Promise.resolve()
expect_throws(_ => eval(scriptyPolicy.createScript('script_run_beacon="i ran"')));
assert_not_equals(script_run_beacon, 'i ran'); // Code did not run.
return p;
}, "Trusted Type violation report: evaluating a Trusted Script violates script-src.");
promise_test(t => {
trustedTypes.createPolicy('default', {
createScript: s => s.replace('payload', 'default policy'),
}, true);
let p = Promise.resolve()
.then(promise_violation((e) =>
e.effectiveDirective.includes('script-src') &&
e.sample.includes("default policy")))
expect_throws(_ => eval('script_run_beacon="payload"')); // script-src will block.
assert_not_equals(script_run_beacon, 'default policy'); // Code did not run.
return p;
}, "Trusted Type violation report: script-src restrictions apply after the default policy runs.");