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Test Web Compatibility requirements for implementation-defined locale-specific ECMAScript APIs #41760

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Sep 5, 2023
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Test Web Compatibility requirements for implementation-defined locale-specific ECMAScript APIs #41760

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Test Web Compatibility requirements for implementation-defined locale…
mathiasbynens Sep 1, 2023
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Add one more example
mathiasbynens Sep 1, 2023
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Add README
mathiasbynens Sep 5, 2023
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37 changes: 37 additions & 0 deletions ecmascript/locale-compat.html
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<!DOCTYPE html>
<meta charset="utf-8">
<!--
Copyright (C) 2023 the V8 project authors. All rights reserved.
This code is governed by the BSD license found in the LICENSE file.
-->
<title>Web Compatibility requirements for implementation-defined locale-specific JavaScript APIs</title>
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Note that I intentionally kept both the file name and the title generic enough, to allow us to add more historical examples of known Web Compat breakages to this file in the future.

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

test(t => { // https://bugs.chromium.org/p/chromium/issues/detail?id=1414292

const date = new Date('2022-12-31T23:59:42');
const localeString = date.toLocaleString('en-US');

// No U+202F NARROW NO-BREAK SPACE must be present.
assert_false(localeString.includes('\u202F'));
// The character between the time and AM/PM should be U+0020 SPACE.
assert_regexp_match(localeString, /:\d\d:\d\d\x20[AP]M/);

}, '`Date.prototype.toLocaleString` produces U+0020 instead of U+202F for `en-US` locale');

test(t => { // https://bugs.chromium.org/p/chromium/issues/detail?id=1414292

const date = new Date('2022-12-31T23:59:42');
const formatter = new Intl.DateTimeFormat('en', {timeStyle: 'long'})
const formattedString = formatter.format(date);

// No U+202F NARROW NO-BREAK SPACE must be present.
assert_false(formattedString.includes('\u202F'));
// The character between the time and AM/PM should be U+0020 SPACE.
assert_regexp_match(formattedString, /:\d\d:\d\d\x20[AP]M/);

}, '`Intl.DateTimeFormat.prototype.format` produces U+0020 instead of U+202F for `en` locale');

</script>