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Test Info: Warnings

<!DOCTYPE html>
<meta charset="utf-8">
<title>Encoding: ISO-2022-JP unencodable replacement in form submission</title>
<link rel="author" title="Benjamin C. Wiley Sittler"
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
'use strict';
promise_test(async testCase => {
const target = Object.assign(document.createElement('iframe'), {
name: 'target',
if (document.readyState !== 'complete') {
await new Promise(resolve => addEventListener('load', resolve));
document.body.insertBefore(target, document.body.firstChild);
const form = Object.assign(document.createElement('form'), {
acceptCharset: 'iso-2022-jp',
// NOTE: This uses escape and unescape rather than
// encodeURI/encodeURIComponent and decodeURI/decodeURIComponent
// intentionally, because:
// - escape() is required because encodeURI{,Component} encodes
// using UTF-8, and would falsely imply that non-ASCII
// characters are expected to work here -- which they won't, as
// the data URI has ISO-2022-JP charset; likewise
// - unescape() is required because the encoded byte sequence
// we're trying to decode and verify represents ISO-2022-JP data
// rather than the UTF-8 expected by decodeURI{,Component}
// The resulting document inside the IFRAME will look like:
// <body onload="..."><plaintext>?utf16=...
action: 'data:text/html;charset=iso-2022-jp,' + escape(
'<body onload="(' +
(() => parent.postMessage({
utf16: document.body.innerText.split('=').pop(),
iso2022jp: unescape(location.href.split('=').pop()),
}, '*')) +
form.appendChild(Object.assign(document.createElement('input'), {
name: 'utf16',
value: 'ABC~ยคโ€ขโ˜…ๆ˜Ÿ๐ŸŒŸๆ˜Ÿโ˜…โ€ขยค~XYZ',
document.body.insertBefore(form, document.body.firstChild);
const {iso2022jp, utf16} = await new Promise(resolve => {
addEventListener('message', ({data}) => resolve(data));
assert_equals(utf16, 'ABC~&#164;&#8226;โ˜…ๆ˜Ÿ&#127775;ๆ˜Ÿโ˜…&#8226;&#164;~XYZ');
}, 'Form submission using ISO-2022-JP correctly replaces unencodables');