Returns the Unicode Normalization Form of a specified string.
Syntax
stringObj.normalize([form]);
Parameters
stringObj
Required. The string object to test against.
form
Optional. The Unicode Normalization Form value.
Return Value
The Unicode Normalization Form of a specified string.
Exceptions
If form is an unsupported value, a RangeError is thrown.
Remarks
If stringObj isn't a string, it will be converted to a string before the method attempts to return the Unicode Normalization Form of the string.
form must be a Unicode Normalization Form value, "NFC", "NFD", "NFKC", or "NFKD", corresponding to values specified for Unicode Standard Annex #15. The default value of form is "NFC".
Example
The following code examples show the use of the normalize method.
// ANGSTORM SIGN and LATIN CAPITAL A WITH RING ABOVE is canonically equivalent
"\u212b".normalize("NFC") === "\u00c5";
// Decomposed, ANGSTOM SIGN is LATIN CAPITAL A followed by COMBINING RING ABOVE
"\u212b".normalize("NFD") === "\u0041\u030a"
// Normalization Form C will combine the result back into the precombined character
"\u0041\u030a".normalize("NFC") === "\u00c5"
// LATIN SMALL LIGATURE FI is compatibility equivalent with LATIN SMALL LETTER F followed by
// LATIN SMALL LETTER I.
"\ufb01".normalize("NFKD") === "fi";
// Same mapping in NFKC
"\ufb01".normalize("NFKC") === "fi";
// NFKC will not recombine compatibility characters.
"fi".normalize("NFKC") === "fi";
Requirements
Supported in Microsoft Edge (Edge browser). Also supported in Store apps (Microsoft Edge on Windows 10). See Version Information.
Not supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Not supported in Windows 8.1.

