TextDecoder.fatal
The fatal read-only property of the TextDecoder interface is a Boolean indicating whether the error mode is fatal.
If the property is true then a decoder will throw a TypeError if it encounters malformed data while decoding.
If false the decoder will substitute the invalid data with the replacement character U+FFFD (�).
The value of the property is set in the TextDecoder() constructor.
Value
A boolean which will return true if the error mode is set to fatal.
Otherwise it returns false, indicating that the error mode is "replacement".