250903 2023-01-20 08:58:30 -0800 toLocaleLowerCase and toLocaleUpperCase do not throw on empty string 2023-01-23 14:22:20 -0800 1 1 1 Unclassified WebKit JavaScriptCore Safari 16 Unspecified Unspecified RESOLVED FIXED BrowserCompat, InRadar P2 Normal --- 1 flackr ysuzuki karlcow mmaxfield webkit-bug-importer ysuzuki oldest_to_newest 1926919 0 464579 flackr 2023-01-20 08:58:30 -0800 Created attachment 464579 Demonstrates the error thrown with a string passed and none without. I believe by spec toLocaleLowerCase / toLocaleUpperCase are required to throw a RangeError if you specify an invalid locale per section 9.2.1 CanicalizeLocaleList with the exception thrown in step 7.c.v (https://tc39.es/ecma402/#sec-canonicalizelocalelist) Firefox throws a RangeError for both of the following: ''.toLocaleLowerCase(''); ''.toLocaleUpperCase(''); Chrome throws a RangeError for ''.toLocaleUpperCase('') and before M109 did for ''.toLocaleLowerCase(''), the lack of error for lowercase is tracked as https://crbug.com/1409058 Safari does not throw an error if the string being converted is empty, but does if you have a non-empty string being converted. 1927541 1 webkit-bug-importer 2023-01-23 12:22:28 -0800 <rdar://problem/104568214> 1927542 2 ysuzuki 2023-01-23 12:24:12 -0800 Pull request: https://github.com/WebKit/WebKit/pull/8986 1927588 3 ews-feeder 2023-01-23 14:22:17 -0800 Committed 259242@main (e99f5f69bf90): <https://commits.webkit.org/259242@main> Reviewed commits have been landed. Closing PR #8986 and removing active labels. 464579 2023-01-20 08:58:30 -0800 2023-01-20 08:58:30 -0800 Demonstrates the error thrown with a string passed and none without. test-locale.html text/html 515 flackr PCFET0NUWVBFIGh0bWw+CjxzdHlsZT4KZGl2IHsKICB3aGl0ZS1zcGFjZTogcHJlOwp9Cjwvc3R5 bGU+CjxkaXYgaWQ9ImxvZyI+PC9kaXY+CjxzY3JpcHQ+CmZ1bmN0aW9uIHRlc3QocykgewogIGxl dCBlbCA9IGRvY3VtZW50LmdldEVsZW1lbnRCeUlkKCdsb2cnKTsKICBsZXQgcmVzdWx0ID0gYFRl c3QgJHtzfTogYDsKICB0cnkgewogICAgcmVzdWx0ICs9IGV2YWwocyk7CiAgfSBjYXRjaCAoZSkg ewogICAgcmVzdWx0ICs9IGUudG9TdHJpbmcoKTsKICB9CiAgZWwudGV4dENvbnRlbnQgKz0gcmVz dWx0ICsgJ1xuJzsKfQoKZG9jdW1lbnQuYWRkRXZlbnRMaXN0ZW5lcignRE9NQ29udGVudExvYWRl ZCcsICgpID0+IHsgCiAgdGVzdCgiJ2EnLnRvTG9jYWxlTG93ZXJDYXNlKCcnKSIpOwogIHRlc3Qo IidhJy50b0xvY2FsZVVwcGVyQ2FzZSgnJykiKTsKICB0ZXN0KCInJy50b0xvY2FsZUxvd2VyQ2Fz ZSgnJykiKTsKICB0ZXN0KCInJy50b0xvY2FsZVVwcGVyQ2FzZSgnJykiKTsKfSk7Cjwvc2NyaXB0 Pgo=