v8/test/intl/number-format/parse-percent.js

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var nf = new Intl.NumberFormat(['en'], {style: 'percent'});

assertEquals(1.2343, nf.v8Parse('123.43%'));
assertEquals(1.23, nf.v8Parse('123%'));
assertEquals(NaN, nf.v8Parse(NaN));
assertEquals(123.23, nf.v8Parse('123,23%'));
assertEquals(123.23456, nf.v8Parse('123,23.456%'));
assertEquals(123.23456, nf.v8Parse('0000000123,23.456%'));
assertEquals(-123.23456, nf.v8Parse('-123,23.456%'));