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Test Info:

<!DOCTYPE html>
<meta charset="utf-8"/>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/cookies/resources/cookie-helper.sub.js"></script>
<!-- We're appending an <iframe> to the document's body, so execute tests after we have a body -->
<body>
<script>
function create_test(target, expectedDomStatus, title) {
promise_test(async t => {
let cookieValue = await new Promise((resolve, reject) => {
var iframe = document.createElement("iframe");
window.onmessage = t.step_func(e => {
if (e.source == iframe.contentWindow) {
document.body.removeChild(iframe);
resolve(e.data.value);
}
});
iframe.src = target + "/cookies/samesite/resources/iframe.document.html";
document.body.appendChild(iframe);
});
await new Promise((resolve, reject) => {
var iframe = document.createElement("iframe");
window.onmessage = t.step_func(e => {
if (e.source == iframe.contentWindow) {
// Cleanup, then verify cookie state:
document.body.removeChild(iframe);
const cookies = e.data;
assert_equals(cookies["dc_samesite_none"], cookieValue, "SameSite=none cookies can be set via document.cookies even by cross-origin documents");
if (expectedDomStatus === DomSameSiteStatus.SAME_SITE) {
assert_equals(cookies["dc_samesite_lax"], cookieValue, "SameSite=lax cookies can be set via document.cookies by same-site documents");
assert_equals(cookies["dc_samesite_strict"], cookieValue, "SameSite=strict cookies can be set via document.cookies by same-site documents");
} else if (expectedDomStatus === DomSameSiteStatus.CROSS_SITE) {
assert_not_equals(cookies["dc_samesite_lax"], cookieValue, "SameSite=lax cookies can be set via document.cookies by same-site documents");
assert_not_equals(cookies["dc_samesite_strict"], cookieValue, "SameSite=strict cookies can be set via document.cookies by same-site documents");
}
resolve();
}
});
iframe.src = target + "/cookies/resources/postToParent.py";
document.body.appendChild(iframe);
});
}, title);
}
create_test(SECURE_ORIGIN, DomSameSiteStatus.SAME_SITE, "Same-site iframes can set lax/strict cookies via document.cookie");
create_test(SECURE_CROSS_SITE_ORIGIN, DomSameSiteStatus.CROSS_SITE, "Cross-site iframe cannot set lax/strict cookies via document.cookie");
</script>